diff --git a/.gitignore b/.gitignore
index c66e12fd..3132d9dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,7 +9,8 @@ jszip-esm.js
 logs
 mod
 node_modules
+pack
 package-lock.json
 three.js
 tmp
-pack
+web/boot/bundle.bin
diff --git a/app.js b/app.js
index f5e629f4..57b03227 100644
--- a/app.js
+++ b/app.js
@@ -37,6 +37,7 @@ let util;
 let dir;
 let log;
 let pre;
+let alt;
 
 const EventEmitter = require('events');
 class AppEmitter extends EventEmitter {}
@@ -64,6 +65,7 @@ function init(mod) {
     startTime = time();
     lastmod = mod.util.lastmod;
     logger = mod.log;
+    alt = ENV.alt;
     pre = ENV.pre || mod.meta.pre;
     debug = ENV.debug || mod.meta.debug;
     oversion = ENV.over || mod.meta.over;
@@ -191,6 +193,19 @@ function init(mod) {
             append[key] = minify(append[key]);
         }
     }
+
+    if (alt) {
+        for (let [ key, val ] of Object.entries(append)) {
+            let src = `src/main/${key}.js`;
+            if (!fs.existsSync(src)) {
+                logger.log('missing:', src);
+                continue;
+            }
+            fs.mkdirSync(`alt/main`, { recursive: true });
+            let body = fs.readFileSync(src);
+            fs.writeFileSync(`alt/main/${key}.js`, body + val);
+        }
+    }
 };
 
 // either add module assets to path or require(init.js)
@@ -288,14 +303,14 @@ function initModule(mod, file, dir) {
             const path = mod.dir + '/' + dir + '/' + file;
             try {
                 const body = fs.readFileSync(path);
-                // console.log({ inject: code, file, opt });
+                logger.log({ inject: code, file, opt });
                 if (opt.first) {
                     append[code] = body.toString() + '\n' + append[code];
                 } else {
                     append[code] += body.toString() + '\n';
                 }
             } catch (e) {
-                console.log({ missing_file: path, dir, mod });
+                logger.log({ missing_file: path, dir, mod });
             }
         },
         onload(fn) {
@@ -430,6 +445,10 @@ function generateDevices() {
     let dstr = JSON.stringify(devs);
     util.mkdir(PATH.join(dir,"src","pack"));
     fs.writeFileSync(PATH.join(dir,"src","pack","kiri-devs.js"), `export const devices = ${dstr};`);
+    if (alt) {
+        fs.mkdirSync('alt/pack', { recursive: true });
+        fs.writeFileSync(PATH.join(dir,"alt","pack","kiri-devs.js"), `export const devices = ${dstr};`);
+    }
 }
 
 function minify(code) {
@@ -526,7 +545,13 @@ function fixedmap(prefix, map) {
 // HTTP 307 redirect
 function redir(path, type) {
     return (req, res, next) => {
-        http.redirect(res, path, type);
+        let query = req.url.split('?')[1];
+        let rpath = path;
+        if (query && path.indexOf('?') < 0) {
+            rpath += `?${query}`;
+        }
+        // console.log({ redir: req.url, to: path, query, new_path: rpath });
+        http.redirect(res, rpath, type);
     }
 }
 
diff --git a/bin/bundle.config.json b/bin/bundle.config.json
index 655fa67e..e7bd3566 100644
--- a/bin/bundle.config.json
+++ b/bin/bundle.config.json
@@ -1,11 +1,17 @@
 {
+    "compress": false,
     "outputs": {
-      "bundle": "./web/kiri/bundle.bin"
+      "bundle": "./web/boot/bundle.bin"
     },
     "inputs": [
-      { "root": "./web", "prefix": "" },
-      { "root": "./src", "prefix": "lib" },
-      { "root": "./src/wasm", "prefix": "wasm" },
-      { "root": "./src/wasm", "prefix": "lib/kiri/wasm" }
+      { "root": "web", "prefix": "" },
+      { "root": "alt", "prefix": "lib"},
+      { "root": "src", "prefix": "lib"},
+      { "root": "src/wasm", "prefix": "wasm" },
+      { "root": "src/wasm", "prefix": "lib/kiri/wasm" }
+    ],
+    "excludes": [
+        "src/pack",
+        "web/boot/bundle.bin"
     ]
 }
diff --git a/bin/bundler.mjs b/bin/bundler.mjs
index 21cec2bd..e63aba3e 100644
--- a/bin/bundler.mjs
+++ b/bin/bundler.mjs
@@ -3,11 +3,21 @@ import path from 'path';
 import uglify from 'uglify-js';
 import { Buffer } from 'buffer';
 
-const cfg = JSON.parse(fs.readFileSync(process.argv[2] || './bundle.config.json', 'utf8'));
-const compress = process.env.UGLIFY ? true : false
+const cfg = JSON.parse(fs.readFileSync(process.argv[2] || './bin/bundle.config.json', 'utf8'));
+const { inputs, outputs, excludes, compress } = cfg;
+const envcomp = process.env.COMPRESS ? JSON.parse(process.env.COMPRESS) : undefined;
+const debug = process.env.DEBUG;
 
 // --- recursive directory walker (follows symlinks safely) ---
 function* walk(dir, seen = new Set()) {
+    dir = path.normalize(dir);
+    if (excludes.indexOf(dir) >= 0) {
+        return;
+    }
+    if (!fs.existsSync(dir)) {
+        return;
+    }
+
     const real = fs.realpathSync(dir);
     if (seen.has(real)) {
         return;
@@ -25,13 +35,19 @@ function* walk(dir, seen = new Set()) {
 
 // --- collect all files according to config ---
 let entries = [];
-for (const input of cfg.inputs) {
+let virtMap = new Set();
+for (const input of inputs) {
     const root = input.root;
     const prefix = input.prefix || '';
     for (const file of walk(root)) {
         const rel = path.relative(root, file).replace(/\\/g, '/');
         const virt = prefix ? `${prefix}/${rel}` : rel;
-        entries.push({ file, virt });
+        if (virtMap.has(virt)) {
+            console.log('pre-existing', virt, rel, root);
+        } else {
+            entries.push({ file, virt });
+            virtMap.add(virt);
+        }
     }
 }
 
@@ -40,28 +56,54 @@ const dataParts = [];
 const entryMeta = [];
 let offset = 0;
 let cache = new Map();
+let compEnable = (envcomp ?? compress);
+let cacheDir = cfg.cacheDir ?? ".bcache";
+
+if (compEnable) {
+    fs.mkdirSync(cacheDir, { recursive: true });
+}
+
+function fileTime(path) {
+    try {
+        return (fs.statSync(path).ctimeMs/1000) | 0;
+    } catch (e) {
+        return 0;
+    }
+}
 
 for (const { file, virt } of entries) {
+    if (excludes.indexOf(file) >= 0) {
+        continue;
+    }
     let record = cache.get(file);
     if (record) {
-        // console.log({ dup: file });
+        if (debug) console.log({ alias: virt, from: file });
         entryMeta.push({ ...record, virt });
     } else {
+        if (debug) console.log({ write: virt, from: file });
         let data = fs.readFileSync(file);
-        if (compress && file.endsWith("js")) {
-            console.log('compress', file);
-            data = uglify.minify(data.toString(), {
-                compress: {
-                    merge_vars: false,
-                    unused: false
+        if (compEnable && file.endsWith("js")) {
+            let cpath = path.resolve(cacheDir, file);
+            if (fileTime(cpath) > fileTime(file)) {
+                data = fs.readFileSync(cpath);
+                console.log('cached', file);
+            } else {
+                console.log('compress', file);
+                data = uglify.minify(data.toString(), {
+                    compress: {
+                        merge_vars: false,
+                        unused: false
+                    }
+                });
+                // console.log({ to: typeof(data), data });
+                if (!data.code) {
+                    if (debug) console.log({ skip: file });
+                    continue;
                 }
-            });
-            // console.log({ to: typeof(data), data });
-            if (!data.code) {
-                console.log({ skip: file });
-                continue;
+                data = Buffer.from(data.code);
+                fs.mkdirSync(path.dirname(cpath), { recursive: true });
+                fs.writeFileSync(cpath, data);
             }
-            data = Buffer.from(data.code);
         }
         record = { virt, offset, length: data.length };
         cache.set(file, record);
@@ -99,7 +141,7 @@ const header = Buffer.concat([count, ...headerParts]);
 const full = Buffer.concat([header, ...dataParts]);
 
 // --- write final bundle ---
-const outPath = cfg.outputs.bundle || './bundle.bin';
+const outPath = outputs.bundle || './bundle.bin';
 fs.mkdirSync(path.dirname(outPath), { recursive: true });
 fs.writeFileSync(outPath, full); // ⚡ write raw binary
 
diff --git a/notes.md b/notes.md
index 56c74577..e39f50d8 100644
--- a/notes.md
+++ b/notes.md
@@ -32,7 +32,6 @@
 * `B` multi-extruder rendering of raft fails to offset the rest of the print
 * `B` multi-extruder purge blocks fail to generate properly for rafts
 
-* `F` new parameter to cap output flow rate (on printer device)
 * `F` new parameters for bridging speed / bridge fan control
 * `F` convert ranges to z offsets while continuing to show layer #
 * `F` support pillar top/bottom should conform to part
diff --git a/package.json b/package.json
index b0880a91..88a094d8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "grid-apps",
-    "version": "4.3.3",
+    "version": "4.3.4",
     "description": "grid.space 3d slicing & modeling tools",
     "author": "Stewart Allen <sa@grid.space>",
     "license": "MIT",
@@ -61,7 +61,7 @@
         "three": "^0.178.0",
         "three-mesh-bvh": "^0.7.6",
         "uglify-js": "3.14.5",
-        "validator": ">=13.7.0",
+        "validator": ">=13.15.15",
         "ws": "^8.18.2"
     },
     "devDependencies": {
@@ -82,7 +82,7 @@
         "webpack-cli": "^5.1.4"
     },
     "scripts": {
-        "setup": "npm run setup-mods && npm i && npm run clean && npm run dev -- --dryrun && npm run webpack-ext",
+        "setup": "npm run setup-mods && npm i && npm run clean && npm run dev -- --alt --dryrun && npm run webpack-ext",
         "setup-mods": "cd mods && npm i",
         "build": "npm run prebuild && electron-builder",
         "build-nopublish": "npm run prebuild && electron-builder --publish never",
@@ -93,13 +93,13 @@
         "build-win-arm": "npm run build -- --win --arm64",
         "build-mac": "npm run build -- --mac --arm64",
         "build-mac-intel": "npm run build -- --mac --x64",
-        "clean": "rm -rf build data dist src/pack tmp src.old web.old",
+        "clean": "rm -rf build data dist src/pack tmp src.old web.old .bcache",
         "docs-dev": "docusaurus start --config conf/docusaurus.config.js",
         "docs-build": "docusaurus build --config conf/docusaurus.config.js",
         "docs-serve": "docusaurus serve --config conf/docusaurus.config.js",
         "docs-check": "prettier --config ./conf/prettier.config.js ./docs --check",
         "dev": "npm run webpack-ext && gs-app-server --debug --single",
-        "prod": "npm run webpack-ext && npm run webpack-src prod && gs-app-server",
+        "prod": "npm run webpack-ext && npm run webpack-src prod && COMPRESS=1 node bin/bundler.mjs && gs-app-server",
         "prod-pack": "npm run webpack-ext && npm run webpack-src prod",
         "prod-dryrun": "gs-app-server --dryrun",
         "start": "npm run prebuild prod && electron .",
diff --git a/src/kiri/core/codec.js b/src/kiri/core/codec.js
index 3547fb6f..1ad844ac 100644
--- a/src/kiri/core/codec.js
+++ b/src/kiri/core/codec.js
@@ -225,7 +225,9 @@ Widget.prototype.encode = function(state) {
         json: json, // safe for JSON (float32array mess)
         group: this.group.id,
         track: this.track,
-        geo: json ? Array.from(geo) : geo
+        geo: json ? Array.from(geo) : geo,
+        meta: this.meta,
+        anno: this.anno,
     };
     return coded;
 };
@@ -234,8 +236,12 @@ registerDecoder(TYPE.WIDGET, function(v, state) {
     const id = v.id,
         group = v.group || id,
         track = v.track || undefined,
-        widget = newWidget(id, Widget.Groups.forid(group));
+        widget = newWidget(id, Widget.Groups.forid(group)),
+        meta= v.meta || widget.meta,
+        anno = v.anno || widget.anno;
 
+    widget.meta = meta;
+    widget.anno = anno;
     widget.loadVertices(v.json ? v.geo.toFloat32() : v.geo);
     widget.saved = Date.now();
     if (track && track.pos) {
diff --git a/src/kiri/core/conf.js b/src/kiri/core/conf.js
index affad216..ae5512d5 100644
--- a/src/kiri/core/conf.js
+++ b/src/kiri/core/conf.js
@@ -270,9 +270,7 @@ export const conf = {
                 firstLayerFanSpeed: 0,
                 firstLayerFillRate: 35,
                 firstLayerFlatten: 0,
-                firstLayerLineMult: 1.0,
                 firstLayerNozzleTemp: 0,
-                firstLayerPrintMult: 1.0,
                 firstLayerRate: 30,
                 firstLayerYOffset: 0,
                 firstSliceHeight: 0.25,
@@ -293,6 +291,7 @@ export const conf = {
                 outputInvertY: false,
                 outputLayerRetract: false,
                 outputLoops: 0,
+                outputMaxFlowrate: 15,
                 outputMinLayerTime: 10,
                 outputMinSpeed: 5.0,
                 outputPurgeTower: 0,
@@ -302,7 +301,7 @@ export const conf = {
                 outputRetractDwell: 20,
                 outputRetractSpeed: 40,
                 outputRetractWipe: 0,
-                outputScarfLength: 5,
+                outputScarfLength: 0,
                 outputSeekrate: 80,
                 outputShellMult: 1.25,
                 outputShortPoly: 0.0,
@@ -319,7 +318,6 @@ export const conf = {
                 sliceFillAngle: 45,
                 sliceFillGrow: 0,
                 sliceFillOverlap: 0.35,
-                sliceFillRate: 0,
                 sliceFillRepeat: 1,
                 sliceFillSparse: 0.25,
                 sliceFillType: "hex",
@@ -333,7 +331,6 @@ export const conf = {
                 sliceShellOrder: "in-out",
                 sliceShells: 3,
                 sliceSolidMinArea: 1,
-                sliceSolidRate: 0,
                 sliceSupportAngle: 50,
                 sliceSupportArea: 0.1,
                 sliceSupportDensity: 0.1,
@@ -500,6 +497,8 @@ export const conf = {
                 camLatheSpeed: 500,
                 camLatheSpindle: 1000,
                 camLatheTool: 1000,
+                camLatheOffStart: 0,
+                camLatheOffEnd: 0,
                 camLevelDown: 0,
                 camLevelInset: 0.5,
                 camLevelOver: 0.75,
diff --git a/src/kiri/mode/cam/anim-3d-be.js b/src/kiri/mode/cam/anim-3d-be.js
index 204e5b2a..13df6084 100644
--- a/src/kiri/mode/cam/anim-3d-be.js
+++ b/src/kiri/mode/cam/anim-3d-be.js
@@ -5,31 +5,31 @@
 import { CSG } from '../../../geo/csg.js';
 import { Tool } from './tool.js';
 
-let nextMeshID = 1;
-let stock, center, rez;
-let path, pathIndex, tool, tools, last;
-
-let stockZ;
-let stockIndexMsg = false;
-let stockSlices;
-let stockIndex;
-let startTime;
-
-let toolID = -1;
-let toolMesh;
-let toolRadius;
-let toolUpdateMsg;
-
-let animateClear = false;
-let animating = false;
-let moveDist = 0;
-let renderDist = 0;
-let renderDone = false;
-let renderPause = 10;
-let renderSteps = 0;
-let renderSpeed = 0;
-let indexCount = 0;
-let updates = 0;
+let nextMeshID = 1,
+    stock,
+    path,
+    pathIndex,
+    tool,
+    tools,
+    last,
+    stockZ,
+    stockIndexMsg = false,
+    stockSlices,
+    stockIndex,
+    startTime,
+    toolID = -1,
+    toolMesh,
+    toolRadius,
+    toolUpdateMsg,
+    showStock = false,
+    animateClear = false,
+    animating = false,
+    renderDone = false,
+    renderSteps = 0,
+    renderSpeed = 0,
+    indexCount = 0,
+    updates = 0,
+    maxR;
 
 export function init(worker) {
     const { dispatch } = worker;
@@ -45,8 +45,6 @@ export function init(worker) {
         path = print.output.flat();
         tools = settings.tools;
         stock = settings.stock;
-        rez = 1 / Math.sqrt(density / (stock.x * stock.y));
-
         tool = null;
         last = null;
         animating = false;
@@ -56,11 +54,14 @@ export function init(worker) {
         startTime = 0;
         updates = 0;
         stockZ = isIndexed ? 0 : stock.z;
+        maxR = Math.hypot(stock.y, stock.z);
 
         stockSlices = [];
         const { x, y, z } = stock;
         const sliceCount = parseInt(settings.controller.animesh || 2000) / 100;
         const sliceWidth = stock.x / sliceCount;
+
+        if (showStock)
         for (let i = 0; i < sliceCount; i++) {
             let xmin = -(x / 2) + (i * sliceWidth) + sliceWidth / 2;
             let slice = new Stock(sliceWidth, y, z).translate(xmin, 0, 0);
@@ -74,7 +75,6 @@ export function init(worker) {
     };
 
     dispatch.animate2 = function (data, send) {
-        renderPause = data.pause || renderPause;
         renderSpeed = data.speed || 0;
         if (animating) {
             return send.done();
@@ -126,7 +126,6 @@ function renderPath(send) {
         return;
     }
     pathIndex++;
-    // console.log(next.point.z);
 
     if (next.tool && (!tool || tool.getID() !== next.tool.getID())) {
         // on real tool change, go to safe Z first
@@ -143,44 +142,50 @@ function renderPath(send) {
     }
 
     const id = toolID;
-    const rezstep = rez * 2;
+    const rezstep = Math.min(tool.maxDiameter(), 1) / 4;
+    // console.log({ rezstep });
+
     if (last) {
+        // console.log(last.point, next.point);
         const lp = last.point, np = next.point;
         last = next;
+
+        // render move line on client
+        send.data({ line: [ lp, np ]});
+
         // dwell ops have no point
         if (!np || !lp) {
             return renderPath(send);
         }
+
         let dx = np.x - lp.x,
             dy = np.y - lp.y,
             dz = np.z - lp.z,
-            da = Math.abs((np.a || 0) - (lp.a || 0)),
-            dr = (da / 360) * (2 * Math.PI * Math.max(np.z, lp.z)),
-            dist = Math.sqrt(dx * dx + dy * dy + dz * dz + dr * dr);
-
-        moveDist += dist;
-
-        // skip moves that are less than grid resolution
-        if (moveDist < rezstep) {
-            // console.log('skip', moveDist, rezstep, next);
-            renderPath(send);
-            return;
-        }
+            da = (np.a ?? 0) - (lp.a ?? 0), // delta rotation degrees
+            AD = maxR * 2, // arc diameter @ max z
+            dr = (Math.abs(da) / 360) * AD, // delta rotation arc
+            dist = Math.max(Math.hypot(dx, dy, dz), dr); // motion distance
 
+        // console.log({ dz, da, AD, dr, dist });
+        // sub-divide long moves for animation and better boolean ops
         const md = Math.max(Math.abs(dx), Math.abs(dy), Math.abs(dz), dr);
-        const st = Math.ceil(md / rezstep);
-        const mx = dx / st, my = dy / st, mz = dz / st;
-        // const sd = Math.sqrt(mx*mx + my*my + mz*mz + dr*dr);
-        const sd = Math.sqrt(mx * mx + my * my + Math.min(1, mz * mz) + dr * dr);
+        const st = Math.ceil(md / rezstep); // steps
+        const mx = dx / st, my = dy / st, mz = dz / st, ma = da / st;
+        const sd = Math.sqrt(mx * mx + my * my + mz * mz + ma * ma);
+        const sp = next.speed;
         const moves = [];
-        for (let i = 0, x = lp.x, y = lp.y, z = lp.z; i < st; i++) {
-            moves.push({ x, y, z, a: lp.a, md: sd, dx, dy, dz });
+        for (let i = 0, x = lp.x, y = lp.y, z = lp.z, a = lp.a; i < st; i++) {
+            moves.push({ x, y, z, a, md: sd, dx, dy, dz, sp });
             x += mx;
             y += my;
             z += mz;
+            a += ma;
         }
-        moveDist = 0;
-        moves.push({ ...next.point, md: sd });
+        // console.log({ dist: md, steps: st, speed: next.speed, moves });
+
+        // push last point
+        moves.push({ ...next.point, md: sd, sp });
+        // console.log(...moves);
         renderMoves(id, moves, send);
     } else {
         last = next;
@@ -197,7 +202,7 @@ function renderMoves(id, moves, send, seed = 0) {
         if (!pos) {
             throw `no pos @ ${index} of ${moves.length}`;
         }
-        const { dx, dy, dz } = pos;
+        const { dx, dy, dz, sp, md } = pos;
         toolMove(pos);
         // console.log('renderMoves', {id, moves, seed});
         let subs = 0;
@@ -208,15 +213,14 @@ function renderMoves(id, moves, send, seed = 0) {
                     subs++;
                 }
             }
-        // console.log({ index, subs });
-        renderDist += pos.md;
         // pause renderer at specified offsets
-        if (renderSpeed && renderDist >= renderSpeed) {
-            renderDist = 0;
+        if (renderSpeed) {
+            let time = sp ? (md / sp) * 60000 : 10;
+            // console.log({ time, ...pos });
             renderUpdate(send);
             setTimeout(() => {
                 renderMoves(id, moves, send, index + 1);
-            }, renderPause);
+            }, time / renderSpeed);
             return;
         }
     }
diff --git a/src/kiri/mode/cam/anim-3d-fe.js b/src/kiri/mode/cam/anim-3d-fe.js
index 3f31d97f..2300fdab 100644
--- a/src/kiri/mode/cam/anim-3d-fe.js
+++ b/src/kiri/mode/cam/anim-3d-fe.js
@@ -10,24 +10,26 @@ const { client } = api;
 let meshes = {},
     button = {},
     label = {},
+    lineTracker,
     material,
-    speedPauses = [0, 0, 0, 0, 0],
     speedValues = [1, 2, 4, 8, 32],
     speedNames = ["1x", "2x", "4x", "8x", "!!"],
     speedMax = speedValues.length - 1,
     speedIndex = 0,
     speed,
     origin,
-    color = 0;
+    color = 0,
+    A2R = Math.PI / 180;
 
 export function animate_clear2(api) {
     let { anim } = api.ui;
-    client.animate_cleanup2();
+    lineTracker?.clear();
     Object.keys(meshes).forEach(id => deleteMesh(id));
     api.widgets.setAxisIndex(0);
     api.uc.setVisible(anim.laba, true);
     api.uc.setVisible(anim.vala, true);
     anim.vala.value = "0.0";
+    client.animate_cleanup2();
 }
 
 export function animate2(api, delay) {
@@ -86,8 +88,9 @@ Object.assign(client, {
     },
 
     animate_setup2(settings, ondone) {
+        initPathMesh();
         color = settings.controller.dark ? 0x888888 : 0;
-        material = new THREE.MeshPhongMaterial({
+        material = material ?? new THREE.MeshPhongMaterial({
             flatShading: true,
             transparent: false,
             opacity: 0.5,
@@ -102,6 +105,66 @@ Object.assign(client, {
     }
 });
 
+function initPathMesh() {
+    if (lineTracker) {
+        return lineTracker.clear();
+    }
+    let count = 0,
+        max = 10000,
+        rot = new THREE.Euler(0,0,0),
+        geo = new THREE.BufferGeometry(),
+        mat = new THREE.LineBasicMaterial({ color: 0xffff00 }),
+        pos = new Float32Array(max * 6),
+        lines = new THREE.LineSegments(geo, mat),
+        vec = new THREE.Vector3(0,0,0),
+        ang = new THREE.Vector3(1,0,0);
+    geo.setAttribute('position', new THREE.BufferAttribute(pos, 3));
+    let track = lineTracker = {
+        xro(p) {
+            vec.set(p.x, p.y, p.z);
+            vec.applyAxisAngle(ang, p.a * A2R);
+        },
+        add(p1, p2) {
+            let ind = count * 6;
+            track.xro(p1);
+            pos[ind+0] = vec.x;
+            pos[ind+1] = vec.y;
+            pos[ind+2] = vec.z;
+            track.xro(p2);
+            pos[ind+3] = vec.x;
+            pos[ind+4] = vec.y;
+            pos[ind+5] = vec.z;
+            count++;
+            if (count >= max) {
+                let opos = pos;
+                max += 10000;
+                pos = new Float32Array(max * 6),
+                pos.set(opos);
+                geo.setAttribute('position', new THREE.BufferAttribute(pos, 3));
+            }
+            geo.setDrawRange(0, count * 2);
+            geo.attributes.position.needsUpdate = true;
+            track.visible(true);
+        },
+        clear() {
+            count = 0;
+            geo.setDrawRange(0,0);
+            track.rotate(0);
+            track.visible(false);
+        },
+        rotate(angle) {
+            rot.x = angle * A2R;
+            lines.setRotationFromEuler(rot);
+        },
+        visible(bool) {
+            if (bool !== lines.visible) {
+                lines.visible = bool;
+            }
+        }
+    }
+    space.world.add(lines);
+}
+
 function meshAdd(id, ind, pos, ilen, plen) {
     const geo = new THREE.BufferGeometry();
     const pa = plen ? pos.subarray(0, plen * 3) : pos;
@@ -132,6 +195,7 @@ function meshUpdate(id, ind, pos, ilen, plen) {
 
 function deleteMesh(id) {
     space.world.remove(meshes[id]);
+    meshes[id].geometry.dispose();
     delete meshes[id];
 }
 
@@ -165,8 +229,7 @@ function play(opts) {
     }
     client.animate2({
         speed,
-        steps: steps || Infinity,
-        pause: speedPauses[speedIndex]
+        steps: steps || Infinity
     }, handleUpdate);
 }
 
@@ -177,8 +240,7 @@ function fast(opts) {
     button.pause.style.display = '';
     client.animate2({
         speed,
-        steps: steps || Infinity,
-        pause: speedPauses[speedIndex]
+        steps: steps || Infinity
     }, handleUpdate);
 }
 
@@ -216,6 +278,7 @@ function handleUpdate(data) {
     if (data.stock_index !== undefined) {
         api.widgets.setAxisIndex(data.stock_index);
         label.a.value = -data.stock_index.toFixed(1);
+        lineTracker.rotate(-data.stock_index);
     }
     if (data.mesh_index) {
         const { id, index } = data.mesh_index;
@@ -229,9 +292,12 @@ function handleUpdate(data) {
         const { id, ind, pos, ilen, plen } = data.mesh_update;
         meshUpdate(id, ind, pos, ilen, plen);
     }
-    if (data && data.progress) {
+    if (data.progress) {
         label.progress.value = (data.progress * 100).toFixed(1);
     }
+    if (data.line) {
+        lineTracker.add(...data.line);
+    }
 }
 
 function updateSpeed(inc = 0) {
diff --git a/src/kiri/mode/cam/cl-ops.js b/src/kiri/mode/cam/cl-ops.js
index 944f8d2e..5d05ed31 100644
--- a/src/kiri/mode/cam/cl-ops.js
+++ b/src/kiri/mode/cam/cl-ops.js
@@ -9,6 +9,7 @@ import { selectHoles } from './cl-hole.js';
 import { selectHelical } from './cl-helical.js';
 import { surfaceAdd } from './cl-surface.js';
 import { traceAdd } from './cl-trace.js';
+import { opRender } from './client.js';
 
 const { MODES } = api.const;
 const { uc: UC } = api;
@@ -349,7 +350,9 @@ export function createPopOps() {
         tolerance: 'camTolerance',
         filter: 'camContourFilter',
         leave: 'camContourLeave',
-        linear: 'camLatheLinear'
+        linear: 'camLatheLinear',
+        offStart: 'camLatheOffStart',
+        offEnd: 'camLatheOffEnd'
     }).inputs = {
         tool: UC.newSelect(LANG.cc_tool, {}, "tools"),
         // axis:      UC.newSelect(LANG.cd_axis, {}, "xyaxis"),
@@ -360,6 +363,9 @@ export function createPopOps() {
         step: UC.newInput(LANG.cc_sovr_s, { title: LANG.cc_sovr_l, convert: UC.toFloat, bound: UC.bound(0.01, 100.0) }),
         angle: UC.newInput(LANG.cc_sang_s, { title: LANG.cc_sang_l, convert: UC.toFloat, bound: UC.bound(0.01, 180.0) }),
         sep: UC.newBlank({ class: "pop-sep" }),
+        offStart: UC.newInput(LANG.ci_laso_s, { title: LANG.ci_laso_l, convert: UC.toFloat}),
+        offEnd: UC.newInput(LANG.ci_laeo_s, { title: LANG.ci_laeo_l, convert: UC.toFloat}),
+        sep: UC.newBlank({ class: "pop-sep" }),
         tolerance: UC.newInput(LANG.ou_toll_s, { title: LANG.ou_toll_l, convert: UC.toFloat, bound: UC.bound(0, 10.0), units: true, round: 4 }),
         leave: UC.newInput(LANG.cf_leav_s, { title: LANG.cf_leav_l, convert: UC.toFloat, bound: UC.bound(0, 100) }),
         sep: UC.newBlank({ class: "pop-sep" }),
diff --git a/src/kiri/mode/cam/client.js b/src/kiri/mode/cam/client.js
index 8f6af172..65eba6db 100644
--- a/src/kiri/mode/cam/client.js
+++ b/src/kiri/mode/cam/client.js
@@ -29,6 +29,7 @@ const { widgets: WIDGETS } = api;
 class Client {
     animVer = 0;
     camStock;
+    showStock = true;
     current;
     currentIndex;
     flipping;
@@ -640,7 +641,8 @@ export function init() {
     });
 
     api.event.on("cam.stock.toggle", (bool) => {
-        env.camStock && (env.camStock.visible = bool ?? !env.camStock.visible);
+        env.showStock = bool ?? !env.showStock;
+        updateStock();
     });
 
     api.event.on("boolean.click", api.platform.update_bounds);
diff --git a/src/kiri/mode/cam/export.js b/src/kiri/mode/cam/export.js
index 84afee08..41280974 100644
--- a/src/kiri/mode/cam/export.js
+++ b/src/kiri/mode/cam/export.js
@@ -257,17 +257,18 @@ export function cam_export(print, online) {
             points--;
             return;
         }
-        let gn;
-        if (out.emit >= 0 && out.emit <= 3) gn = `G${out.emit}`;
-        let speed = out.speed,
-            arc = out.emit == 2 || out.emit == 3,
-            center = out.center,
-            nl = (compact_output && lastGn === gn) ? [] : [gn],
-            dx = opt.dx || newpos.x - pos.x,
+
+        let dx = opt.dx || newpos.x - pos.x,
             dy = opt.dy || newpos.y - pos.y,
             dz = opt.dz || newpos.z - pos.z,
             da = newpos.a != pos.a,
-            maxf = dz ? maxZd : maxXYd,
+            gv = (dz >= 0 && out.emit >= 0 && out.emit <= 3) ? out.emit : 1,
+            gn = `G${gv}`,
+            speed = out.speed,
+            arc = out.emit == 2 || out.emit == 3,
+            center = out.center,
+            nl = (compact_output && lastGn === gn) ? [] : [gn],
+            maxf = (dz < 0 ? maxZd : maxXYd) || speed,
             feed = Math.min(speed || maxf, maxf),
             dist = Math.sqrt(dx * dx + dy * dy + dz * dz),
             newFeed = feed && feed !== pos.f;
diff --git a/src/kiri/mode/cam/prepare.js b/src/kiri/mode/cam/prepare.js
index cbeefb87..9f3b19b4 100644
--- a/src/kiri/mode/cam/prepare.js
+++ b/src/kiri/mode/cam/prepare.js
@@ -412,7 +412,7 @@ export function prepEach(widget, settings, print, firstPoint, update) {
         }
 
         // convert short planar moves to cuts in some cases
-        if (hasDelta && !isRough && !isArc && isMove && deltaXY <= moveLen && deltaZ <= 0 && !lasering) {
+        if (hasDelta && !isArc && isMove && deltaXY <= moveLen && deltaZ <= 0 && !lasering) {
             let iscontour = tolerance > 0;
             let isflat = absDeltaZ < 0.001;
             // restrict this to contouring
diff --git a/src/kiri/mode/cam/topo4.js b/src/kiri/mode/cam/topo4.js
index 5bd4f528..f29934c2 100644
--- a/src/kiri/mode/cam/topo4.js
+++ b/src/kiri/mode/cam/topo4.js
@@ -38,9 +38,8 @@ export class Topo {
                 x: axis === "x",
                 y: axis === "y"
             },
-            zMin = min.z + 0.0001,
             tolerance = op.tolerance,
-            resolution = tolerance ? tolerance : 1 / Math.sqrt(density / (span.x * span.y)),
+            resolution = (tolerance ? tolerance : 1 / Math.sqrt(density / (span.x * span.y))).round(5),
             step = this.step = (tool.traceOffset() * 2) * op.step,
             angle = this.angle = op.angle || 1;
 
@@ -52,17 +51,20 @@ export class Topo {
             console.log(widget.id, 'topo4 auto tolerance', resolution.round(4));
         }
 
-        this.zBottom = state.zBottom;
+        this.zBottom = state.zBottom ?? 0;
         this.resolution = resolution;
         this.vertices = widget.getGeoVertices({ unroll: true, translate: true });
         this.tabverts = widget.getTabVertices();
         this.tool = tool.generateProfile(resolution).profile;
         this.maxo = tool.profileDim.maxo * resolution;
         this.diam = tool.fluteDiameter();
+        this.unit = tool.unitScale();
         this.zoff = widget.track.top || 0;
         this.leave = op.leave || 0;
         this.linear = op.linear || false;
         this.lineColor = state.settings.controller.dark ? 0xffff00 : 0x555500;
+        this.offStart = op.offStart ?? 0;
+        this.offEnd = op.offEnd ?? 0;
 
         onupdate(0, "lathe");
 
@@ -86,8 +88,8 @@ export class Topo {
     }
 
     async slice(onupdate) {
-        const { vertices, resolution, tabverts, zoff } = this;
-
+        const { vertices, resolution, tabverts, zoff, offStart, offEnd, tool, unit } = this;
+        const { minions } = self.kiri_worker;
         const range = this.range = { min: Infinity, max: -Infinity };
         const box = this.box = new THREE.Box2();
 
@@ -101,9 +103,10 @@ export class Topo {
             range.max = Math.max(range.max, x);
         }
 
-        // add tool radius to slice min/max range ot fully carve part
-        range.min -= this.diam / 2;
-        range.max += this.diam / 2;
+        // add tool diameter to slice min/max range to fully carve part
+        range.min += offStart * unit;
+        range.max -= offEnd * unit;
+        range.max += resolution * 2;
 
         // merge in tab vertices here so they don't affect slice range / dimensions
         for (let i = 0, l = tabverts.length; i < l; i += 3) {
@@ -116,24 +119,31 @@ export class Topo {
         // re-create shared vertex array for workers
         this.vertices = [].appendAll(vertices).appendAll(tabverts).toFloat32().toShared();
 
+        const zSpan = range.max - range.min;
         const shards = Math.ceil(Math.min(25, vertices.length / 27000));
-        const step = (range.max - range.min) / shards;
+        const totalSteps = Math.ceil(zSpan / resolution);
+        const stardSteps = Math.ceil(totalSteps / shards);
+        const stepWidth = stardSteps * resolution;
 
-        let index = 0;
         let slices = this.slices = [];
-        let slice = { min: range.min, max: range.min + step, index };
-
-        for (let z = range.min; z < range.max; z += resolution) {
-            if (z > slice.max) {
-                slices.push(slice);
-                slice = { min: z, max: z + step, index };
-            }
-            index++;
+        for (let i=0; i<shards; i++) {
+            let s;
+            slices.push(s = {
+                min: range.min + i * stepWidth,
+                max: Math.min(range.max, range.min + (i+1) * stepWidth),
+                index: i * stardSteps
+            });
         }
-        slices.push(slice);
-        // console.log({ shards, range, step, slices });
 
-        const { minions } = self.kiri_worker;
+        // console.log({
+        //     shards,
+        //     step: stepWidth,
+        //     range,
+        //     resolution,
+        //     slices: slices.slice(),
+        //     minions
+        // });
+
         if (minions?.running > 1) {
             return await this.sliceMinions(onupdate);
         } else {
@@ -217,10 +227,10 @@ export class Topo {
 
         const tlen = tool.length;
         const slen = slices.length;
-        const sinc = Math.max(1, Math.ceil(step / resolution));
         const heights = [];
 
-        // cull slice lines to only the ones in range (5x faster)
+        // console.log({ tlen, slen, sinc, slices: slices.map(s => s.z) });
+        // cull slice lines to only the ones in range (~5x faster)
         const oslices = [];
         for (let slice of slices) {
             const lines = slice.lines;
@@ -244,7 +254,9 @@ export class Topo {
         // iterate over all slices (real x = z)
         // find max real z using z ray intersect from tool point to slice lines + offset
         let lz = 0;
-        for (let si = 0; si < slen; si += sinc) {
+        for (let sz = 0; ; sz += step) {
+            let si = Math.ceil(sz / resolution);
+            if (si >= oslices.length) break;
             const rx = oslices[si].z;
             let mz = -Infinity;
             // iterate over tool offsets
@@ -281,12 +293,12 @@ export class Topo {
                 }
                 if (mz === -Infinity && xo === 0 && yo === 0) {
                     // tool tip is off the model
-                    continue;
+                    // continue;
                 }
             }
             if (mz === -Infinity) {
-                mz = zBottom; // Math.min(0, lz)
-            } else if (zBottom && mz < zBottom) {
+                mz = zBottom;
+            } else if (mz < zBottom) {
                 mz = zBottom;
             }
             heights.push(rx, 0, lz = mz);
diff --git a/src/kiri/mode/fdm/client.js b/src/kiri/mode/fdm/client.js
index 7bb6d5cf..466856f9 100644
--- a/src/kiri/mode/fdm/client.js
+++ b/src/kiri/mode/fdm/client.js
@@ -34,14 +34,11 @@ export function init() {
         "sliceFillType": LANG.fi_type,
         "sliceFillWidth": LANG.fi_wdth_s,
         "sliceFillSparse": LANG.fi_pcnt_s,
-        "sliceFillRate": LANG.ou_feed_s,
         "sliceFillGrow": LANG.fi_grow_s,
-        "sliceSolidRate": LANG.ou_fini_s,
         "sliceSolidMinArea": LANG.ad_msol_s,
         "sliceTopLayers": LANG.sl_ltop_s,
         "sliceBottomLayers": LANG.sl_lbot_s,
         "firstLayerRate": LANG.fl_rate_s,
-        "firstLayerPrintMult": LANG.fl_mult_s,
         "firstLayerFanSpeed": LANG.ou_fans_s,
         // prepare
         "sliceShellOrder": LANG.sl_ordr_s,
diff --git a/src/kiri/mode/fdm/driver-be.js b/src/kiri/mode/fdm/driver-be.js
index f1164acc..2efb734d 100644
--- a/src/kiri/mode/fdm/driver-be.js
+++ b/src/kiri/mode/fdm/driver-be.js
@@ -9,6 +9,7 @@ import { fdm_export } from './export.js';
 // fil = filament diameter
 // slice = slice height
 function extrudePerMM(noz, fil, slice) {
+    // (ratio of nozzle to filament) * (ratio of slice to nozzle)
     return ((Math.PI * util.sqr(noz / 2)) / (Math.PI * util.sqr(fil / 2))) * (slice / noz);
 };
 
diff --git a/src/kiri/mode/fdm/export.js b/src/kiri/mode/fdm/export.js
index 6b359f56..a65d6ca9 100644
--- a/src/kiri/mode/fdm/export.js
+++ b/src/kiri/mode/fdm/export.js
@@ -26,7 +26,6 @@ export function fdm_export(print, online, ondone, ondebug) {
         { extrudeAbs } = device,
         { exportThumb } = controller,
         { extrudeMM, extrudePerMM } = FDM,
-        extused = Object.keys(print.extruders).map(v => parseInt(v)),
         timeFactor = (device.gcodeTime || 1) * 1.5,
         decimals = config.gcode_decimals || 4,
         zMoveMax = device.deviceZMax || 0,
@@ -49,7 +48,6 @@ export function fdm_export(print, online, ondone, ondebug) {
         last = null,
         zpos = 0,
         bmax = 0,
-        blastz = 0,
         belt_add_y = (process.firstLayerYOffset || 0) - (belty || 0),
         oloops = process.outputLoops || 0,
         zhop = process.zHopDistance || 0, // range
@@ -58,10 +56,8 @@ export function fdm_export(print, online, ondone, ondebug) {
         retDist = process.outputRetractDist || 0, // range
         retSpeed = process.outputRetractSpeed * 60 || 1, // range
         retDwell = process.outputRetractDwell || 0, // range
-        timeDwell = retDwell / 1000,
         scarfZ = process.outputScarfLength ? true : false,
         arcDist = isBelt || scarfZ ? 0 : (process.arcTolerance || 0),
-        arcMin = 1,
         arcRes = 20,
         arcDev = 0.5,
         arcMax = 40,
@@ -85,7 +81,6 @@ export function fdm_export(print, online, ondone, ondebug) {
         fanSpeedSave = undefined,
         fanSpeedBase = 0,
         fanSpeed = 0,
-        lastType = undefined,
         lastNozzleTemp = nozzleTemp,
         lastBedTemp = bedTemp,
         lastFanSpeed = fanSpeed,
@@ -169,7 +164,6 @@ export function fdm_export(print, online, ondone, ondebug) {
         retDist = params.outputRetractDist || 0; // range
         retSpeed = params.outputRetractSpeed * 60 || 1; // range
         retDwell = params.outputRetractDwell || 0; // range
-        timeDwell = retDwell / 1000;
         nozzleTemp = layer === 0 ?
             params.firstLayerNozzleTemp || params.outputTemp :
             params.outputTemp || params.firstLayerNozzleTemp;
@@ -470,7 +464,7 @@ export function fdm_export(print, online, ondone, ondebug) {
         if (isBelt) {
             let zheight = path ? path.height || 0 : 0;
             epos.x = originCenter ? -pos.x : device.bedWidth - pos.x;
-            epos.z = blastz = pos.z * icos;
+            epos.z = pos.z * icos;
             epos.y = -pos.y + epos.z * bcos + belt_add_y;
             lout = epos;
         }
@@ -635,7 +629,7 @@ export function fdm_export(print, online, ondone, ondebug) {
 
             // emit comment on output type chage
             if (last && out.type !== last.type) {
-                lastType = subst.feature = out.type;
+                subst.feature = out.type;
                 if (gcodeFeature && gcodeFeature.length) {
                     appendAllSub(gcodeFeature);
                 } else {
@@ -752,7 +746,6 @@ export function fdm_export(print, online, ondone, ondebug) {
                             }
 
                             // if new point is off the arc
-                            // if (deem || depm || desp || dc > arcDist || cc.r < arcMin || cc.r > arcMax || dist > cc.r) {
                             if (deem || depm || desp || dc * arcQ.center.length / arcQ.rSum > arcDist || dist > cc.r || cc.r > arcMax || radFault || !arcValid()) {
                                 // let debug = [deem, depm, desp, dc * arcQ.center.length / arcQ.rSum > arcDist, dist > cc.r, cc.r > arcMax, radFault];
                                 if (arcQ.length === 4) {
diff --git a/src/kiri/mode/fdm/init-menu.js b/src/kiri/mode/fdm/init-menu.js
index 07571f0b..453d83da 100644
--- a/src/kiri/mode/fdm/init-menu.js
+++ b/src/kiri/mode/fdm/init-menu.js
@@ -79,6 +79,7 @@ export function menu() {
     _____:               newGroup(LANG.sw_menu, $('fdm-walls'), { modes:FDM, driven, hideable, separator, group:"fdm-walls" }),
     sliceShells:         newInput(LANG.sl_shel_s, { title:LANG.sl_shel_l, convert:toFloat }),
     sliceLineWidth:      newInput(LANG.sl_line_s, { title:LANG.sl_line_l, convert:toFloat, bound:bound(0,5) }),
+    sliceFillOverlap:    newInput(LANG.fi_over_s, {title:LANG.fi_over_l, convert:toFloat, bound:bound(0.0,1.0)}),
     separator:           newBlank({ class:"set-sep", driven }),
     sliceShellOrder:     newSelect(LANG.sl_ordr_s, { title:LANG.sl_ordr_l}, "shell"),
     sliceDetectThin:     newSelect(LANG.ad_thin_s, { title: LANG.ad_thin_l, action: thinWallSave }, "thin"),
@@ -86,19 +87,17 @@ export function menu() {
     sliceZInterleave:    newBoolean(LANG.ad_zint_s, onBooleanClick, {title:LANG.ad_zint_l, show:zIntShow}),
     _____:               newGroup(LANG.fs_menu, $('fdm-solid'), { modes:FDM, driven, hideable, separator, group:"fdm-solid" }),
     sliceFillAngle:      newInput(LANG.fi_angl_s, {title:LANG.fi_angl_l, convert:toFloat}),
-    sliceFillOverlap:    newInput(LANG.fi_over_s, {title:LANG.fi_over_l, convert:toFloat, bound:bound(0.0,2.0)}),
     sliceFillGrow:       newInput(LANG.fi_grow_s, {title:LANG.fi_grow_l, convert:toFloat}),
     sliceSolidMinArea:   newInput(LANG.ad_msol_s, {title:LANG.ad_msol_l, convert:toFloat}),
     _____:               newGroup(LANG.fi_menu, $('fdm-fill'), { modes:FDM, driven, hideable, separator, group:"fdm-fill" }),
     sliceFillType:       newSelect(LANG.fi_type, {trigger}, "infill"),
     sliceFillSparse:     newInput(LANG.fi_pcnt_s, {title:LANG.fi_pcnt_l, convert:toFloat, bound:bound(0.0,1.0), show:hasInfill}),
     sliceFillRepeat:     newInput(LANG.fi_rept_s, {title:LANG.fi_rept_l, convert:toInt,   bound:bound(1,10),    show:fillIsLinear}),
-    separator:           newBlank({ class:"set-sep", driven }),
-    sliceFillRate:       newInput(LANG.ou_feed_s, {title:LANG.ou_feed_l, convert:toInt,   bound:bound(0,500)}),
-    sliceSolidRate:      newInput(LANG.ou_fini_s, {title:LANG.ou_fini_l, convert:toInt,   bound:bound(0,500)}),
     _____:               newGroup(LANG.fh_menu, $('fdm-heat'), { modes:FDM, driven, hideable, separator, group:"fdm-heat" }),
     outputTemp:          newInput(LANG.ou_nozl_s, {title:LANG.ou_nozl_l, convert:toInt}),
     outputBedTemp:       newInput(LANG.ou_bedd_s, {title:LANG.ou_bedd_l, convert:toInt}),
+    separator:           newBlank({ class:"set-sep", driven }),
+    outputDraftShield:   newBoolean(LANG.fr_draf_s, onBooleanClick, {title:LANG.fr_draf_l, trigger, show:() => isNotBelt()}),
     _____:               newGroup(LANG.fc_menu, $('fdm-cool'), { modes:FDM, driven, hideable, separator, group:"fdm-cool" }),
     outputFanLayer:      newInput(LANG.ou_fanl_s, { title:LANG.ou_fanl_l, convert:toInt,   bound:bound(0,255) }),
     outputFanSpeed:      newInput(LANG.ou_fans_s, {title:LANG.ou_fans_l, convert:toInt, bound:bound(0,255)}),
@@ -137,9 +136,6 @@ export function menu() {
     firstLayerFlatten:   newInput(LANG.fl_flat_s, {title:LANG.fl_flat_l, convert:toFloat, show:isBelt}),
     firstLayerRate:      newInput(LANG.fl_rate_s, {title:LANG.fl_rate_l, convert:toFloat}),
     firstLayerFillRate:  newInput(LANG.fl_frat_s, {title:LANG.fl_frat_l, convert:toFloat, show:isNotBelt}),
-    separator:           newBlank({ class:"set-sep", driven, show:isNotBelt }),
-    firstLayerLineMult:  newInput(LANG.fl_sfac_s, {title:LANG.fl_sfac_l, convert:toFloat, bound:bound(0.5,2), show:isNotBelt}),
-    firstLayerPrintMult: newInput(LANG.fl_mult_s, {title:LANG.fl_mult_l, convert:toFloat}),
     separator:           newBlank({ class:"set-sep", driven, show:isBelt }),
     firstLayerBrim:      newInput(LANG.fl_brim_s, {title:LANG.fl_brim_l, convert:toInt,   show:isBelt}),
     firstLayerBrimIn:    newInput(LANG.fl_brin_s, {title:LANG.fl_brin_l, convert:toInt,   show:isBelt}),
@@ -154,7 +150,6 @@ export function menu() {
     outputRaftSpacing:   newInput(LANG.fr_spac_s, {title:LANG.fr_spac_l, convert:toFloat, bound:bound(0.0,3.0), show: () => ui.outputRaft.checked && isNotBelt() }),
     separator:           newBlank({ class:"set-sep", driven, show:isNotBelt }),
     outputRaft:          newBoolean(LANG.fr_nabl_s, onBooleanClick, {title:LANG.fr_nabl_l, trigger, show:() => isNotBelt()}),
-    outputDraftShield:   newBoolean(LANG.fr_draf_s, onBooleanClick, {title:LANG.fr_draf_l, trigger, show:() => isNotBelt()}),
     _____:               newGroup(LANG.ou_menu, $('fdm-output'), { modes:FDM, driven, hideable, separator, group:"fdm-out" }),
     outputFeedrate:      newInput(LANG.ou_feed_s, {title:LANG.ou_feed_l, convert:toInt}),
     outputFinishrate:    newInput(LANG.ou_fini_s, {title:LANG.ou_fini_l, convert:toInt}),
@@ -177,6 +172,7 @@ export function menu() {
     arcTolerance:        newInput(LANG.ad_arct_s, {title:LANG.ad_arct_l, convert:toFloat, bound:bound(0,1.0), show:() => { return isNotBelt() }}),
     outputRetractDwell:  newInput(LANG.ad_rdwl_s, {title:LANG.ad_rdwl_l, convert:toInt}),
     outputMinSpeed:      newInput(LANG.ad_mins_s, {title:LANG.ad_mins_l, convert:toFloat, bound:bound(1,200)}),
+    outputMaxFlowrate:   newInput(LANG.ad_maxf_s, {title:LANG.ad_maxf_l, convert:toFloat, bound:bound(1,200)}),
     outputPurgeTower:    newInput(LANG.ad_purg_s, {title:LANG.ad_purg_l, convert:toInt,   bound:bound(0,1000)}),
     outputScarfLength:   newInput(LANG.ad_scar_s, {title:LANG.ad_scar_l, convert:toFloat, bound:bound(0,1000)}),
     outputShortPoly:     newInput(LANG.ad_spol_s, {title:LANG.ad_spol_l, convert:toFloat, bound:bound(0,10000)}),
diff --git a/src/kiri/mode/fdm/post.js b/src/kiri/mode/fdm/post.js
index b910958a..88168a09 100644
--- a/src/kiri/mode/fdm/post.js
+++ b/src/kiri/mode/fdm/post.js
@@ -82,12 +82,9 @@ export function slicePost(data, options) {
         let trg = shellFrac > 0.5 ? 1 : parts - 1;
         sliceShells += rem >= trg ? 1 : 0;
     }
-    const isFirst = index === 0;
-    const height = process.sliceHeight;
-    const spaceMult = isFirst ? process.firstLayerLineMult || 1 : 1;
     const count = isSynth ? 1 : sliceShells;
-    const offset =  shellOffset * spaceMult;
-    const fillOff = fillOffset * spaceMult;
+    const offset =  shellOffset;
+    const fillOff = fillOffset;
     const thinType = isSynth ? undefined : process.sliceDetectThin;
     const nutops = [];
     // co-locate shell processing with top generation in slicer
diff --git a/src/kiri/mode/fdm/prepare.js b/src/kiri/mode/fdm/prepare.js
index 301d47fb..680cc075 100644
--- a/src/kiri/mode/fdm/prepare.js
+++ b/src/kiri/mode/fdm/prepare.js
@@ -1,5 +1,6 @@
 /** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
 
+import { FDM } from './driver-be.js';
 import { base, util } from '../../../geo/base.js';
 import { poly2polyEmit, tip2tipEmit } from '../../../geo/paths.js';
 import { newBounds } from '../../../geo/bounds.js';
@@ -682,7 +683,6 @@ export async function fdm_prepare(widgets, settings, update) {
             for (let rec of layer) {
                 overate = rec.overate >= 0 ? rec.overate : overate;
                 let brate = params.firstLayerRate || firstLayerRate;
-                let bmult = params.firstLayerPrintMult || params.firstLayerPrintMult;
                 let point = rec.point;
                 let belty = rec.belty = -point.y + (point.z * belt.slope);
                 let lowrate = belty <= thresh ? brate : overate || brate;
@@ -694,7 +694,6 @@ export async function fdm_prepare(widgets, settings, update) {
                 if (rec.emit && belty <= thresh && lastout && Math.abs(lastout.belty - belty) < 0.01) {
                     // apply base speed to segments touching belt
                     rec.speed = params.firstLayerRate || Math.min(rec.speed, lowrate);
-                    rec.emit *= bmult;
                     rec.fan = params.firstLayerFanSpeed;
                     minx = Math.min(minx, point.x, lastout.point.x);
                     maxx = Math.max(maxx, point.x, lastout.point.x);
@@ -794,10 +793,22 @@ export async function fdm_prepare(widgets, settings, update) {
     }
 };
 
+
+/**
+ * Output and route Slice (shell,fill) paths for a single Slice
+ *
+ * @param {*} print Print output Object
+ * @param {*} slice current slice being Output
+ * @param {*} startPoint starting point for this layer
+ * @param {*} offset start point offset
+ * @param {*} output output prebuffer
+ * @param {*} opt options
+ */
 function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
     const { settings } = print;
     const { device } = settings;
     const { bedWidth, bedDepth, bedRound } = device;
+    const { extrudePerMM } = FDM;
 
     let preout = [],
         process = opt.params || settings.process,
@@ -806,6 +817,7 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
         scarfLength = process.outputScarfLength || 0,
         minLayerTime = process.outputMinLayerTime || 0,
         nozzleSize = process.sliceLineWidth || device.extruders[extruder].extNozzle,
+        nozzles = device.extruders.map(e => e.extNozzle),
         firstLayer = (opt.first || false) && !opt.support,
         thinWall = nozzleSize * (opt.thinWall || 1.75),
         retractDist = opt.retractOver || (nozzleSize * 5),
@@ -817,17 +829,17 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
         fanSpeed = process.outputFanSpeed,
         firstShellSpeed = process.firstLayerRate,
         firstFillSpeed = process.firstLayerFillRate,
-        firstPrintMult = process.firstLayerPrintMult,
         finishSpeed = firstLayer ? firstShellSpeed : (opt.speed || process.outputFinishrate),
         printSpeed = opt.speed || (firstLayer ? firstShellSpeed : process.outputFeedrate),
         fillSpeed = opt.speed || opt.fillSpeed || (firstLayer ? firstFillSpeed || firstShellSpeed : process.outputFeedrate),
-        infillSpeed = process.sliceFillRate || opt.infillSpeed || fillSpeed || printSpeed,
+        infillSpeed = opt.infillSpeed || fillSpeed || printSpeed,
         moveSpeed = process.outputSeekrate,
         minSpeed = process.outputMinSpeed,
         origin = startPoint.add(offset),
         zhop = process.zHopDistance || 0,
         zmax = opt.zmax,
         antiBacklash = process.antiBacklash,
+        maxFlowRate = process.outputMaxFlowrate,
         wipeDist = process.outputRetractWipe || 0,
         isBelt = device.bedBelt,
         bedOffset = originCenter ? {
@@ -851,11 +863,6 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
         shellOrder = -shellOrder;
     }
 
-    // update fill speed when solids detected
-    if (slice.finishSolids) {
-        fillSpeed = process.sliceSolidRate || finishSpeed;
-    }
-
     // on flats layers also slow down shell print speed
     if (slice.isFlatsLayer) {
         printSpeed = finishSpeed || printSpeed;
@@ -867,13 +874,6 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
         printSpeed /= 2;
     }
 
-    // apply first layer extrusion multipliers
-    if (firstLayer) {
-        fillMult *= firstPrintMult;
-        shellMult *= firstPrintMult;
-        sparseMult *= firstPrintMult;
-    }
-
     function retract() {
         let array = preout.length ? preout : output;
         if (array.length) {
@@ -1595,16 +1595,34 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
         if (!p.emit) continue;
         let mms = p.speed ?? 1;
         let dst = lp?.distTo2D(p.point) ?? 0;
+        lp = p.point;
         if (dst) {
             tt += (dst/mms);
             td += dst;
+            p.dst = dst;
         }
-        lp = p.point;
     }
     if (minLayerTime && tt < minLayerTime) {
         let fact = tt / minLayerTime;
         for (let p of preout) {
-            if (p.emit) p.speed = Math.max(p.speed * fact, minSpeed);
+            if (p.emit) {
+                p.speed = Math.max(p.speed * fact, minSpeed);
+            }
+        }
+    }
+
+    // apply speed damping when output exceeds volumetric flowrate cap
+    if (maxFlowRate) {
+        for (let p of preout) {
+            if (p.emit && p.dst) {
+                let vfr = nozzles[p.tool] * slice.height * p.speed;
+                if (vfr > maxFlowRate) {
+                    let old = p.speed;
+                    let damp = maxFlowRate / vfr;
+                    p.speed = p.speed * damp;
+                    // console.log({ vfr, damp, old, new: p.speed });
+                }
+            }
         }
     }
 
@@ -1617,7 +1635,7 @@ function slicePrintPath(print, slice, startPoint, offset, output, opt = {}) {
     print.addPrintPoints(preout, output);
 
     // bridge layer fan change
-    if (slice.isBridgeLayer) {
+    if (preout.length && slice.isBridgeLayer) {
         preout[0].fan = Math.round(fanSpeed / 3);
         preout.peek().fan = fanSpeed;
     }
diff --git a/src/kiri/mode/fdm/slice.js b/src/kiri/mode/fdm/slice.js
index 9bda3df8..5bc215da 100644
--- a/src/kiri/mode/fdm/slice.js
+++ b/src/kiri/mode/fdm/slice.js
@@ -498,7 +498,6 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
         // just the top/bottom special solid layers or range defined solid layers
         forSlices(0.15, 0.2, slice => {
             let range = slice.params;
-            let spaceMult = slice.index === 0 ? process.firstLayerLineMult || 1 : 1;
             let isBottom = slice.index < bottomLayers;
             let isTop = topLayers && slice.index > slices.length - topLayers - 1;
             let isTopBase = isTop && slice.index === slices.length - topLayers;
@@ -506,7 +505,7 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
             let isSolid = (isBottom || ((isTop || isDense) && !vaseMode)) && !isSynth;
             let solidWidth = isSolid ? range.sliceFillWidth || 1 : 0;
             if (solidWidth) {
-                let fillSpace = fillSpacing * spaceMult * solidWidth;
+                let fillSpace = fillSpacing * solidWidth;
                 doSolidLayerFill(slice, fillSpace, sliceFillAngle);
             }
             if (slice.index === slices.length - 1) {
@@ -755,8 +754,7 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
                 let params = slice.params || process;
                 let first = slice.index === 0;
                 let solidWidth = params.sliceFillWidth || 1;
-                let spaceMult = first ? params.firstLayerLineMult || 1 : 1;
-                let fillSpace = fillSpacing * spaceMult * solidWidth;
+                let fillSpace = fillSpacing * solidWidth;
                 let solidMinArea = params.sliceSolidMinArea;
                 doSolidsFill(slice, fillSpace, sliceFillAngle, solidMinArea, promises);
                 sliceFillAngle = (sliceFillAngle + 90.0) % 360;
diff --git a/src/kiri/run/minion.js b/src/kiri/run/minion.js
index ae1c2920..412da396 100644
--- a/src/kiri/run/minion.js
+++ b/src/kiri/run/minion.js
@@ -315,7 +315,6 @@ const funcs = self.minion = {
 
         const topo4 = Object.assign(new Topo4(), cache.lathe);
         const heights = topo4.lathePath(stmp, tool);
-
         reply({ seq, heights });
     }
 };
diff --git a/src/moto/license.js b/src/moto/license.js
index f3975212..669e0eb7 100644
--- a/src/moto/license.js
+++ b/src/moto/license.js
@@ -3,7 +3,7 @@
 const terms = {
     COPYRIGHT: "Copyright (C) Stewart Allen <sa@grid.space> - All Rights Reserved",
     LICENSE: "See the license.md file included with the source distribution",
-    VERSION: "4.3.3"
+    VERSION: "4.3.4"
 };
 
 export const beta = 0;
diff --git a/src/moto/space.js b/src/moto/space.js
index 8aa5047d..45101885 100644
--- a/src/moto/space.js
+++ b/src/moto/space.js
@@ -98,7 +98,6 @@ let WIN = self.window || {},
     fontColor = '#333333',
     fontScale = 1.4, // computed relative to grid size
     rulerColor,
-    axisColor,
     axesOn = true,
     volumeOn = true,
     viewControl,
@@ -388,7 +387,6 @@ function setPlatformColor(color) {
 function setFont(options) {
     if (options.color) fontColor = options.color;
     if (options.scale) fontScale = options.scale;
-    if (options.axisColor) axisColor = options.axisColor;
     if (options.rulerColor) rulerColor = options.rulerColor;
     updateRulers();
 }
diff --git a/web/boot/index.html b/web/boot/index.html
new file mode 100644
index 00000000..8f7c9381
--- /dev/null
+++ b/web/boot/index.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <title>Kiri:Moto (loading)</title>
+    <style>
+        body {
+            top: 0;
+            left: 0;
+            right: 0;
+            bottom: 0;
+            display: flex;
+            position: fixed;
+            align-items: center;
+            flex-direction: column;
+            justify-content: center;
+            font-family: sans-serif;
+            font-weight: bold;
+        }
+    </style>
+    <script type="module">
+        import { version } from '/lib/moto/license.js';
+        (async () => {
+            const reg = await navigator.serviceWorker.register('/boot/service.js', { scope: '/' });
+            await reg.update();
+            await navigator.serviceWorker.ready;
+
+            if (!navigator.serviceWorker.controller) {
+                console.log('No controller → reloading under SW control');
+                location.reload();
+                return;
+            }
+
+            // turn url params into key/value map
+            const map = Object.fromEntries(
+                (location.search || location.hash).slice(1).split('&')
+                .map(v => v.split('='))
+                .map(([k, v = true]) => [k, v])
+            );
+            if (map.debug) {
+                console.log({ map });
+            }
+
+            navigator.serviceWorker.controller.postMessage({
+                clear: map.clear,
+                disable: map.disable,
+                version: map.version || version
+            });
+
+            navigator.serviceWorker.addEventListener('message', e => {
+                console.log('[SM]', e.data);
+                    setTimeout(() => {
+                        if (map.mesh) {
+                        location.replace('/mesh/index.html');
+                    } else {
+                        location.replace('/kiri/index.html');
+                    }
+                }, map.delay || 10);
+            });
+        })();
+    </script>
+</head>
+
+<body>Booting Grid.Space</body>
+
+</html>
\ No newline at end of file
diff --git a/web/boot/service.js b/web/boot/service.js
new file mode 100644
index 00000000..8d0f405a
--- /dev/null
+++ b/web/boot/service.js
@@ -0,0 +1,203 @@
+// --- configurable ---
+const CACHE_VERSION = 'boot-001';
+const BUNDLE_URL = '/boot/bundle.bin';
+const VERSION_KEY = '/__version__';
+
+let loaded = 0;
+let mode = 'cached';
+let currentVersion = null;
+
+// --- logging ---
+const log = (...a) => console.log('[SW]', ...a);
+self.addEventListener('install', e => log('install'));
+self.addEventListener('activate', e => log('activate'));
+// self.addEventListener('fetch', e => log('fetch', e.request.url));
+
+// --- lifecycle ---
+self.skipWaiting();
+self.addEventListener('activate', e => e.waitUntil(clients.claim()));
+
+// --- mode control ---
+self.addEventListener('message', e => {
+    const data = e.data || {};
+    const { clear, disable, version } = data;
+    if (clear) {
+        clearCache();
+    }
+    if (disable) {
+        mode = 'transparent';
+        broadcast('transparent mode');
+        unregister();
+    } else if (version !== undefined) {
+        mode = 'cached';
+        log('version', version);
+        ensureVersion(version);
+    }
+});
+
+// --- unregister current service worker ---
+async function unregister() {
+    await self.registration.unregister();
+}
+
+// --- erase existing cache ---
+async function clearCache() {
+    log('clearing cache');
+    await caches.delete(CACHE_VERSION);
+}
+
+// --- version check and preload ---
+async function ensureVersion(incomingVersion) {
+    const cache = await caches.open(CACHE_VERSION);
+    let needPreload = false;
+
+    const existing = await cache.match(VERSION_KEY);
+    if (!existing) {
+        log('no version stored → preload');
+        needPreload = true;
+    } else {
+        const stored = await existing.text();
+        if (stored !== incomingVersion) {
+            log(`mismatch ${stored} ≠ ${incomingVersion} → preload`);
+            needPreload = true;
+        }
+    }
+
+    if (needPreload) {
+        await preloadBundle();
+        await cache.put(
+            VERSION_KEY,
+            new Response(String(incomingVersion), { headers: { 'Content-Type': 'text/plain' } })
+        );
+        broadcast(`preload added ${loaded} files`);
+    } else {
+        broadcast('preload cached');
+    }
+}
+
+// --- fetch with redirect handler ---
+async function fetch_safe(req) {
+    const res = await fetch(req);
+    if (res.redirected) {
+        log({ was_redirected_cloning: res.url });
+        // clone into a fresh non-redirect response
+        const clone = res.clone();
+        return new Response(await clone.blob(), {
+            headers: clone.headers,
+            status: 200,
+            statusText: 'OK'
+        });
+    }
+    return res;
+}
+
+// --- fetch handler ---
+self.addEventListener('fetch', e => {
+    const { request } = e;
+    const url = new URL(request.url);
+
+    if (request.method !== 'GET') return;
+
+    if (mode == 'transparent') {
+        e.respondWith(fetch_safe(e.request));
+        return;
+    }
+
+    if (url.pathname.endsWith("/")) {
+        return e.respondWith(redirectOr404(appendURL(url, 'index.html').pathname));
+    } else if (url.pathname.indexOf(".") < 0) {
+        return e.respondWith(redirectOr404(appendURL(url, '/index.html').pathname));
+    } else {
+        e.respondWith(fromCacheOrNetwork(request));
+    }
+});
+
+// --- helpers ---
+function appendURL(url, append) {
+    return new URL(url.origin + url.pathname + append + url.search);
+}
+
+async function redirectOr404(path) {
+    const cache = await caches.open(CACHE_VERSION);
+    const hit = await cache.match(path, { ignoreSearch: true });
+    if (hit) {
+        return Response.redirect(path, 302);
+    } else {
+        return new Response('Not Found', { status: 404, statusText: 'Not Found' });
+    }
+}
+
+async function fromCacheOrNetwork(req) {
+    const cache = await caches.open(CACHE_VERSION);
+    const hit = await cache.match(req, { ignoreSearch: true });
+    if (hit) {
+        return hit;
+    }
+    const net = await fetch_safe(req);
+    cache.put(req, net.clone());
+    log(`put: ${net.url}`);
+    return net;
+}
+
+async function broadcast(message) {
+    const clientsList = await clients.matchAll({ type: 'window' });
+    for (const client of clientsList) {
+        client.postMessage(message);
+    }
+}
+
+const sec_headers = {
+    'Cross-Origin-Opener-Policy': 'same-origin',
+    'Cross-Origin-Embedder-Policy': 'require-corp'
+};
+
+// --- preload & unpack bundle ---
+async function preloadBundle() {
+    loaded = 0;
+    const cache = await caches.open(CACHE_VERSION);
+    const res = await fetch(BUNDLE_URL, { cache: 'no-store' });
+    const buf = await res.arrayBuffer();
+    const files = await unpackBundle(buf);
+    await Promise.all(
+        Object.entries(files).map(([path, blob]) => {
+            const ext = path.split('.').pop();
+            const type =
+                ext === 'html' ? 'text/html' :
+                ext === 'js' ? 'application/javascript' :
+                ext === 'css' ? 'text/css' :
+                ext === 'json' ? 'application/json' :
+                ext === 'wasm' ? 'application/wasm' :
+                ext === 'svg' ? 'image/svg+xml' :
+                        'application/octet-stream';
+            const headers = { 'Content-Type': type, ...sec_headers };
+            const resp = new Response(blob, { headers });
+            loaded++;
+            return cache.put('/' + path, resp);
+        })
+    );
+}
+
+// --- simple bundle format ---
+// [count:uint32][entries...][file data...]
+// entry: [nlen:uint16][name][offset:uint32][length:uint32]
+async function unpackBundle(buf) {
+    const view = new DataView(buf);
+    let pos = 0;
+    const count = view.getUint32(pos, true); pos += 4;
+    const decoder = new TextDecoder();
+    const table = [];
+
+    for (let i = 0; i < count; i++) {
+        const nlen = view.getUint16(pos, true); pos += 2;
+        const name = decoder.decode(new Uint8Array(buf, pos, nlen)); pos += nlen;
+        const offset = view.getUint32(pos, true); pos += 4;
+        const len = view.getUint32(pos, true); pos += 4;
+        table.push({ name, offset, len });
+    }
+
+    const files = {};
+    for (const { name, offset, len } of table)
+        files[name] = buf.slice(offset, offset + len);
+
+    return files;
+}
diff --git a/web/kiri/index.css b/web/kiri/index.css
index ad3b7705..efc8c86d 100644
--- a/web/kiri/index.css
+++ b/web/kiri/index.css
@@ -1378,7 +1378,7 @@ details[open] summary::after {
     padding: 0 0 0 0;
 }
 #oplist {
-    max-height: 70vh;
+    max-height: calc(70vh - 200px);
     min-height: 0;
     overflow-y: auto;
     padding-top: 1px;
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 39eb200d..ea00c48b 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -356,7 +356,7 @@ self.lang['en-us'] = {
     ad_thin_l:      ["detect and fill gaps","between shell walls"],
 
     // FDM SHELLS
-    sl_line_s:      "shell width",
+    sl_line_s:      "line width",
     sl_line_l:      ["extrusion width in millimeters","0 = nozzle diameter"],
     sl_ordr_s:      "shell order",
     sl_ordr_l:      ["output shell order","inside to outside","or outside to inside","affects surface quality"],
@@ -369,8 +369,8 @@ self.lang['en-us'] = {
 
     // FDM SOLID
     fs_menu:        "solid fill",
-    fi_over_s:      "shell overlap",
-    fi_over_l:      ["overlap with shell and other fill","for improved extrusion bonding","as fraction of nozzle diameter","0.0 - 2.0"],
+    fi_over_s:      "fill overlap",
+    fi_over_l:      ["overlap between shells and solid or sparse infill. can improve bonding to shells","as fraction of line width","0.0 - 1.0"],
     fi_angl_s:      "start angle",
     fi_angl_l:      ["starting angle in degrees","90 degrees added to ","each following layer","applies only to solid layers"],
     fi_grow_s:      "area expand",
@@ -654,6 +654,10 @@ self.lang['en-us'] = {
     ci_face_l:      "select face to rotate facing up",
     ci_line_s:      "linear",
     ci_line_l:      "make linear passes along X then rotate Y",
+    ci_laso_s:      "offset start",
+    ci_laso_l:      ["x offet from left of part. negative values are outside of the part. in workspace units"],
+    ci_laeo_s:      "offset end",
+    ci_laeo_l:      ["x offet from right of part. negative values are outside of the part. in workspace units"],
 
     // CNC LASER On/Off Operations (Carvera)
     cl_powr_s:      "power",
@@ -675,10 +679,6 @@ self.lang['en-us'] = {
     cl_maxz_s:      "max z height",
     cl_maxz_l:      ["highest Z band position. when set to 0, uses the highest Z point of the workspace"],
 
-
-
-
-
     // CNC CUTOUT TABS
     ct_menu:        "tabs",
     ct_angl_s:      "angle",
@@ -864,10 +864,12 @@ self.lang['en-us'] = {
     ad_rdwl_l:      ["time between re-engaging","filament and movement","in milliseconds"],
     ad_scst_s:      "shell coast",
     ad_scst_l:      ["non-printing end","of perimeter shells","in millimeters"],
-    ad_msol_s:      "min area",
-    ad_msol_l:      ["minimum area (mm^2)","required to keep solid","must be > 0.1"],
+    ad_msol_s:      "area filter",
+    ad_msol_l:      ["minimum area (mm^2)","bridges and flats less than this are culled"],
     ad_mins_s:      "min speed",
     ad_mins_l:      ["minimum speed","for short segments"],
+    ad_maxf_s:      "max flowrate",
+    ad_maxf_l:      ["maximum volumetric flowrate supported by this print head and filament","in millimeters^3 / second"],
     ad_scar_s:      "scarf length",
     ad_scar_l:      ["ease up length for scarf joint. disables arc detection","0 = disabled"],
     ad_spol_s:      "short path",
diff --git a/web/kiri/manifest.json b/web/kiri/manifest.json
index 0f24310a..5d913d11 100644
--- a/web/kiri/manifest.json
+++ b/web/kiri/manifest.json
@@ -1,5 +1,5 @@
 {
-    "name": "Kiri:Moto 4.3.3",
+    "name": "Kiri:Moto 4.3.4",
     "short_name": "Kiri:Moto",
     "description": "Slicer for 3D printers, CNC mills, laser cutters and more",
     "start_url": "/kiri/",