diff --git a/app.js b/app.js
index 01b55b6d..2285ec80 100644
--- a/app.js
+++ b/app.js
@@ -309,7 +309,7 @@ const script = {
         "mode/sla/driver",
         "mode/sla/slice",
         "mode/sla/export",
-        "mode/sla/x_halot",
+        "mode/sla/x_cxdlp",
         "mode/sla/x_photon",
         "mode/cam/driver",
         "mode/cam/ops",
diff --git a/src/kiri/export.js b/src/kiri/export.js
index d8c0884c..563fe8e1 100644
--- a/src/kiri/export.js
+++ b/src/kiri/export.js
@@ -60,27 +60,19 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
     }
 
     function callExportSLA(options) {
-        const preview = [];
         KIRI.client.export(API.conf.get(), (line) => {
             API.show.progress(line.progress, "exporting");
-            if (line.data) {
-                preview.push(line.data);
-            }
         }, (output, error) => {
             API.show.progress(0);
             if (error) {
                 API.show.alert(error, 5);
             } else {
-                KIRI.driver.SLA.printDownload(preview, output, API);
+                KIRI.driver.SLA.printDownload(output, API);
             }
         });
     }
 
     function exportLaserDialog(data) {
-        // if (!isPrepared()) {
-        //     return API.function.prepare(exportLaser);
-        // }
-
         const filename = "laser-"+(new Date().getTime().toString(36));
         const settings = API.conf.get();
         const driver = KIRI.driver.LASER;
diff --git a/src/mode/sla/client.js b/src/mode/sla/client.js
index d58a7213..38169f04 100644
--- a/src/mode/sla/client.js
+++ b/src/mode/sla/client.js
@@ -19,9 +19,8 @@
         });
     };
 
-    SLA.printDownload = function(preview, output, API) {
-        const lines = preview;
-        const { file, width, height } = output;
+    SLA.printDownload = function(output, API) {
+        const { file, width, height, layers } = output;
         const filename = `print-${new Date().getTime().toString(36)}`;
 
         API.ajax("/kiri/output-sla.html", html => {
@@ -31,10 +30,10 @@
                 process = settings.process,
                 device = settings.device,
                 print_sec = (process.slaBaseLayers * process.slaBaseOn) +
-                    (lines.length - process.slaBaseLayers) * process.slaLayerOn;
+                    (layers - process.slaBaseLayers) * process.slaLayerOn;
 
             // add peel lift/drop times to total print time
-            for (let i=0; i<lines.length; i++) {
+            for (let i=0; i<layers; i++) {
                 let dist = process.slaPeelDist,
                     lift = process.slaPeelLiftRate,
                     drop = process.slaPeelDropRate,
@@ -51,7 +50,7 @@
 
             let print_min = Math.floor(print_sec/60),
                 print_hrs = Math.floor(print_min/60),
-                download = $('print-photon');
+                download = $('print-sla');
 
             // add lift/drop time
             print_sec -= (print_min * 60);
@@ -61,7 +60,7 @@
             print_hrs = print_hrs.toString().padStart(2,'0');
 
             $('print-filename').value = filename;
-            $('print-layers').value = lines.length;
+            $('print-layers').value = layers;
             $('print-time').value = `${print_hrs}:${print_min}:${print_sec}`;
 
             switch (device.deviceName) {
@@ -80,29 +79,6 @@
                     break;
             }
 
-            let canvas = $('print-canvas');
-            // rotate 90 degrees for export view
-            canvas.width = height;
-            canvas.height = width;
-            let ctx = canvas.getContext('2d');
-            let img = ctx.createImageData(height, width);
-            let imgDV = new DataView(img.data.buffer);
-            let range = $('print-range');
-            range.value = 0;
-            range.min = 0;
-            range.max = lines.length - 1;
-            range.oninput = function() {
-                let pdata = lines[range.value];
-                if (!pdata) return;
-                let lineDV = new DataView(pdata);
-                for (let i=0; i<lineDV.byteLength; i++) {
-                    imgDV.setUint32(i*4, lineDV.getUint8(i));
-                }
-                ctx.putImageData(img,0,0);
-                $('print-layer').innerText = range.value.padStart(4,'0');
-            };
-
-            range.oninput();
             API.modal.show('print');
         });
     }
diff --git a/src/mode/sla/export.js b/src/mode/sla/export.js
index b9ec9c95..e95f3d79 100644
--- a/src/mode/sla/export.js
+++ b/src/mode/sla/export.js
@@ -64,13 +64,10 @@
                 let {image, layers, end} = render(param);
                 images.push(image);
                 slices.push(layers);
-                // transfer image memory to browser main
-                image = image.buffer;
                 online({
                     progress: (index / layermax) * part1,
                     message: "image_gen",
-                    data: image
-                }, [image]);
+                });
                 if (end) break;
             }
 
@@ -89,41 +86,39 @@
             }, (progress, message) => {
                 online({progress: progress * part2 + part1, message});
             });
-            ondone({
-                width: width,
-                height: height,
-                file: file
-            },[file]);
+            ondone({ width, height, file, layers: images.length }, [file]);
         } else {
-            let part1 = 0.25;
+            let part1 = 0.95;
             let part2 = 1 - part1;
-            let images = [];
             let slices = [];
 
             for (let index=0; index < layermax; index++) {
                 let param = { index, width, height, widgets, scaleX, scaleY };
-                let {image, lines} = CXDLP.render(param);
-                images.push(image);
+                let {lines} = CXDLP.render(param);
                 slices.push(lines);
-                // transfer image memory to browser main
-                // it *should* be sampled to save memory
-                image = image ? image.buffer : undefined;
                 online({
                     progress: (index / layermax) * part1,
-                    message: "image_gen",
-                    data: image
-                }, [image]);
+                    message: "image_gen"
+                });
                 // bail on an empty layer
                 if (lines.length === 0) {
                     break;
                 }
             }
 
-            let file = CXDLP.export({settings, width, height, slices});
+            // generate thumb, preview1, preview2
+
+            let file = CXDLP.export({
+                settings,
+                width,
+                height,
+                slices
+            });
             ondone({
                 width: width,
                 height: height,
-                file: file
+                file: file,
+                layers: slices.length
             }, [file]);
         }
 
diff --git a/src/mode/sla/x_halot.js b/src/mode/sla/x_halot.js
deleted file mode 100644
index 85da6ac7..00000000
--- a/src/mode/sla/x_halot.js
+++ /dev/null
@@ -1,386 +0,0 @@
-(function() {
-
-    const default_values = {
-        magic1: 'CXSW3DV2',
-        magic2: 'CXSW3DV2',
-        model: 'CL-89',
-        version: 1,
-        layer_count: 0,
-        res_x: 3840,
-        res_y: 2400,
-        height: 0,
-        thumb: undefined,
-        preview1: undefined,
-        preview2: undefined,
-        dim_x: '192.000000',
-        dim_y: '120.000000',
-        layer: '0.050000',
-        light_on: 6,
-        light_off: 2,
-        light_pwm: 255,
-        lift_dist: 6,
-        lift_speed: 60,
-        down_speed: 150,
-        base_layers: 8,
-        base_light_on: 60,
-        base_light_pwm: 255,
-        base_lift_dist: 5,
-        base_lift_speed: 60
-    };
-    const data_term = 0x0d0a;
-
-    class CXDLP {
-        constructor() {
-            Object.assign(this, default_values);
-        }
-
-        // takes a DataView Object
-        read(view) {
-            let read = new DataReader(view, 0);
-
-            function read_string(dbl) {
-                let len = read.readU32();
-                let str = '';
-                while (--len > 0) {
-                    if (dbl) {
-                        read.readU8();
-                        len--;
-                    }
-                    str += String.fromCharCode(read.readU8());
-                }
-                if (!dbl) {
-                    read.skip(1); // null term on byte strings
-                }
-                return str;
-            }
-
-            let meta = {
-                view,
-                magic1: read_string(),
-                version: read.readU16(),
-                model: read_string(),
-                layer_count: read.readU16(),
-                res_x: read.readU16(),
-                res_y: read.readU16(),
-                height: read.readU32(),
-                skip: read.skip(60),
-                thumb: read.skip(26914),
-                preview1: read.skip(168202),
-                preview2: read.skip(168202),
-                dim_x: read_string(true),
-                dim_y: read_string(true),
-                layer: read_string(true),
-                light_on: read.readU16(),
-                light_off: read.readU16(),
-                base_light_on: read.readU16(),
-                base_layers: read.readU16(),
-                base_lift_dist: read.readU16(),
-                base_lift_speed: read.readU16(),
-                lift_dist: read.readU16(),
-                lift_speed: read.readU16(),
-                down_speed: read.readU16(),
-                base_light_pwm: read.readU16(),
-                light_pwm: read.readU16()
-            };
-
-            // read layer record lengths
-            let layers = this.layers = [];
-            for (let i=0; i<meta.layer_count; i++) {
-                layers.push({ length: read.readU32() });
-            }
-            if (read.readU16() !== data_term) {
-                throw `invalid data term @ ${read.pos - 2}`;
-            }
-
-            // read layer meta data, not line data
-            for (let i=0; i<meta.layer_count; i++) {
-                let size = read.readU32();
-                if (size !== layers[i].length) {
-                    throw `layer length mismatch: ${size} != ${layers[i].length} @ i=${i}`;
-                }
-                let lines = read.readU32();
-                layers[i].lines = lines;
-                layers[i].pos = read.pos; // store line data position
-                // skip line data and check data term is valid
-                read.skip(lines * 6);
-                if (read.readU16() !== data_term) {
-                    throw `invalid data term @ ${read.pos - 2}`;
-                }
-            }
-
-            // read trailing magic
-            meta.magic2 = read_string();
-
-            // compute checksum and verify
-            let cksum = 0;
-            for (let i=0; i<read.pos; i++) {
-                cksum = cksum ^ view.getUint8(i);
-            }
-
-            meta.checksum = cksum;
-
-            if (cksum !== read.readU32()) {
-                throw `checksum mismatch`;
-            }
-
-            delete meta.skip;
-            Object.assign(this, meta);
-
-            return this;
-        }
-
-        get_layer_lines(layer) {
-            if (this.view) {
-                if (layer > this.layers.length) {
-                    throw `layer out of range 0-${this.layers.length}`;
-                }
-                let out = [];
-                let rec = this.layers[layer];
-                let { lines, pos } = rec;
-                for (let j=0; j<lines; j++) {
-                    let d1 = this.view.getUint16(pos); pos += 2;
-                    let d2 = this.view.getUint16(pos); pos += 2;
-                    let d3 = this.view.getUint16(pos); pos += 2;
-                    let y_start = d1 >> 3;
-                    let y_end = ((d1 & 0b111) << 10) | (d2 >> 6);
-                    let x_end = ((d2 & 0b111111) << 8) | (d3 >> 8);
-                    let color = d3 & 0xff;
-                    out.push({y_start, y_end, x_end, color});
-                }
-                return out;
-            } else {
-                throw "missing data view";
-            }
-        }
-
-        write() {
-            let output = new ArrayWriter();
-
-            output.write_string = function write_string(str, dbl = false) {
-                let len = str.length;
-                output.writeU32(dbl ? len * 2 : len + 1);
-                let pos = 0;
-                while (pos < len) {
-                    if (dbl) {
-                        output.writeU8(0);
-                    }
-                    output.writeU8(str.charCodeAt(pos++));
-                }
-                if (!dbl) {
-                    output.writeU8(0);
-                }
-            }
-
-            let layers = this.layers;
-            this.layer_count = layers.length;
-            output.write_string(this.magic1);
-            output.writeU16(this.version);
-            output.write_string(this.model);
-            output.writeU16(this.layer_count);
-            output.writeU16(this.res_x);
-            output.writeU16(this.res_y);
-            output.writeU32(this.height);
-            output.skip(60);
-            output.skip(26912); // thumb
-            output.writeU16(data_term);
-            output.skip(168200); // preview1
-            output.writeU16(data_term);
-            output.skip(168200); // preview1
-            output.writeU16(data_term);
-            output.write_string(this.dim_x, true);
-            output.write_string(this.dim_y, true);
-            output.write_string(this.layer, true);
-            output.writeU16(this.light_on);
-            output.writeU16(this.light_off);
-            output.writeU16(this.base_light_on);
-            output.writeU16(this.base_layers);
-            output.writeU16(this.base_lift_dist);
-            output.writeU16(this.base_lift_speed);
-            output.writeU16(this.lift_dist);
-            output.writeU16(this.lift_speed);
-            output.writeU16(this.down_speed);
-            output.writeU16(this.base_light_pwm);
-            output.writeU16(this.light_pwm);
-
-            // write placeholder layer length to capture position
-            for (let layer of layers) {
-                layer.l1 = output.pos;
-                output.writeU32(0);
-            }
-            output.writeU16(data_term);
-
-            // write out encoded layers
-            for (let layer of layers) {
-                layer.l2 = output.pos;
-                // placeholder to be written post
-                output.writeU32(0);
-                output.writeU32(layer.lines.length);
-                let start = output.pos;
-                for (let line of layer.lines) {
-                    let b1 = (line.y_start >> 5);
-                    let b2 = ((line.y_start << 3) | (line.y_end >> 10)) & 0xff;
-                    let b3 = (line.y_end >> 2) & 0xff;
-                    let b4 = ((line.y_end << 6) | (line.x_end >> 8)) & 0xff;
-                    let b5 = (line.x_end) & 0xff;
-                    output.writeU8(b1);
-                    output.writeU8(b2);
-                    output.writeU8(b3);
-                    output.writeU8(b4);
-                    output.writeU8(b5);
-                    output.writeU8(line.color);
-                }
-                layer.length = output.pos - start;
-                output.writeU16(data_term);
-            }
-
-            output.write_string(this.magic2);
-            let ckpos = output.pos;
-
-            // retrace and write layer lengths
-            for (let layer of layers) {
-                output.seek(layer.l1);
-                output.writeU32(layer.length);
-                output.seek(layer.l2);
-                output.writeU32(layer.length);
-            }
-
-            output.seek(ckpos);
-            // compute xor checksum
-            let cksum = 0;
-            let array = output.array;
-            for (let i=0; i<array.length; i++) {
-                cksum = cksum ^ (array[i] || 0);
-            }
-            output.writeU32(cksum);
-
-            return output.toBuffer();
-        }
-    }
-
-    CXDLP.export = function(params) {
-        let { settings, width, height, slices } = params;
-
-        let cxdlp = new CXDLP();
-        cxdlp.layers = slices.map(a => {return { lines: a }});
-
-        return cxdlp.write();
-    };
-
-    CXDLP.render = function(params) {
-        let { width, height, index, widgets, scaleX, scaleY  } = params;
-        let width2 = width / 2, height2 = height / 2;
-        let array = [];
-        let count = 0;
-
-        function scaleMovePoly(poly) {
-            let points = poly.points;
-            poly._bounds = undefined;
-            for (let i=0, il=points.length; i<il; i++) {
-                let p = points[i];
-                p.y = height - (p.y * scaleY + height2);
-                p.x = p.x * scaleX + width2;
-            }
-            if (poly.inner) {
-                for (let i=0, ia=poly.inner, il=poly.inner.length; i<il; i++) {
-                    scaleMovePoly(ia[i]);
-                }
-            }
-        }
-
-        // serialize poly into wasm heap memory
-        function writePoly(writer, poly) {
-            let pos = writer.skip(2);
-            let inner = poly.inner;
-            writer.writeU16(inner ? inner.length : 0, true);
-            let points = poly.points;
-            let bounds = poly.bounds;
-            writer.writeU16(points.length, true);
-            writer.writeU16(bounds.minx, true);
-            writer.writeU16(bounds.maxx, true);
-            writer.writeU16(bounds.miny, true);
-            writer.writeU16(bounds.maxy, true);
-            for (let j=0, jl=points.length; j<jl; j++) {
-                let point = points[j];
-                writer.writeF32(point.x, true);
-                writer.writeF32(point.y, true);
-            }
-            if (inner && inner.length) {
-                for (let i=0, il=inner.length; i<il; i++) {
-                    writePoly(writer, inner[i]);
-                }
-            }
-            // write total struct length at struct head
-            writer.view.setUint16(pos, writer.pos - pos, true);
-        }
-
-        widgets.forEach(widget => {
-            let slice = widget.slices[index];
-            if (slice) {
-                if (slice.synth) count++;
-                let polys = slice.unioned;
-                if (!polys) polys = slice.tops.map(t => t.poly);
-                if (slice.supports) polys.appendAll(slice.supports);
-                array.appendAll(polys.map(poly => {
-                    return poly.clone(true).move(widget.track.pos);
-                }));
-                count += polys.length;
-            }
-        });
-
-        let wasm = kiri.driver.SLA.wasm;
-        let imagelen = width * height;
-        let writer = new self.DataWriter(new DataView(wasm.memory.buffer), imagelen);
-        writer.writeU16(width, true);
-        writer.writeU16(height, true);
-        writer.writeU16(array.length, true);
-
-        // scale and move all polys to fit in rendered platform coordinates
-        for (let i=0, il=array.length; i<il; i++) {
-            let poly = array[i];
-            scaleMovePoly(poly);
-            writePoly(writer, poly);
-        }
-        wasm.render(0, imagelen, 0);
-        let image = wasm.heap;//.slice(0, imagelen);
-        let lines = [];
-        for (let x=0; x<width; x++) {
-            let y_start = 0;
-            let lastv = 0;
-            for (let y=0; y<height; y++) {
-                let v = image[x * height + y];
-                if (v !== lastv) {
-                    if (lastv) {
-                        // emit any non-zero sequence
-                        lines.push({y_start, y_end: y, x_end: x, color: lastv});
-                    }
-                    if (v) {
-                        // start a new sequence
-                        y_start = y;
-                    }
-                }
-                lastv = v;
-            }
-        }
-        return { lines };
-        // return { image, lines };
-    }
-
-    if (!this.navigator && this.process && this.process.env) {
-        let fs = require('fs');
-        let self = this;
-        eval(fs.readFileSync("src/add/class.js").toString());
-        let args = process.argv.slice(2);
-        let file = args.shift();
-        // let fpos = 0;
-        let view = new DataView(fs.readFileSync(file).buffer);
-        let read = new DataReader(view, 0);
-        let cxdlp = new CXDLP().read(view);
-        console.log({
-            cxdlp,
-            layers5: cxdlp.layers.slice(0,5),
-            lines1: cxdlp.get_layer_lines(1)
-        });
-    } else if (this.navigator) {
-        this.CXDLP = CXDLP;
-    }
-}());
diff --git a/web/kiri/cxdlp.html b/web/kiri/cxdlp.html
index 79acc84e..df0c6ed1 100644
--- a/web/kiri/cxdlp.html
+++ b/web/kiri/cxdlp.html
@@ -9,6 +9,9 @@
             display: flex;
             flex-direction: row;
         }
+        th {
+            text-align: left;
+        }
         #slider {
             flex-grow: 1;
         }
@@ -17,7 +20,7 @@
         }
     </style>
     <script src="/src/add/class.js"></script>
-    <script src="/src/mode/sla/x_halot.js"></script>
+    <script src="/src/mode/sla/x_cxdlp.js"></script>
     <script>
         function onload() {
             document.addEventListener("drop", (ev) => {
@@ -30,6 +33,7 @@
                     console.log({cxdlp});
                     slider.max = layers.value = cxdlp.layers.length - 1;
                     render(slider.value = layer.value = 0);
+                    meta(cxdlp);
                 };
                 reader.readAsArrayBuffer(files[0]);
                 console.log("drop", files);
@@ -53,6 +57,20 @@
                 render(slider.value = layer.value);
             };
         }
+        function row(key,value) {
+            return `<tr><th>${key}</th><td>${value}</td></tr>`;
+        }
+        function meta(cxdlp) {
+            let rows = Object.entries(cxdlp).filter(e => {
+                let t = typeof(e[1]);
+                return t === 'number' || t === 'string';
+            }).map(e => row(e[0], e[1]));
+            params.innerHTML = [
+                '<table>',
+                ...rows,
+                '</table>'
+            ].join('');
+        }
         function render(layer) {
             let cxdlp = window.cxdlp;
             if (!cxdlp || layer > cxdlp.layers.length || layer < 0) {
@@ -84,5 +102,11 @@
         <input id="layers" size=5 disabled=true>
     </div>
     <canvas id="canvas" width=4000 height=2000></canvas>
+    <div>
+        <div id="params"></div>
+        <canvas id="thumb"></canvas>
+        <canvas id="pre1"></canvas>
+        <canvas id="pre2"></canvas>
+    </div>
 </body>
 </html>
diff --git a/web/kiri/output-sla.html b/web/kiri/output-sla.html
index 9725614e..57606c0a 100644
--- a/web/kiri/output-sla.html
+++ b/web/kiri/output-sla.html
@@ -7,14 +7,5 @@
 
 <div class="header"><label>download</label></div>
 <div class="f-row box">
-    <button id="print-photon" class="grow">download</button>
-</div>
-
-<div class="header"><label>preview</label></div>
-<div class="f-col box a-center j-center">
-    <div class="f-row a-center j-center">
-        <input id="print-range" type="range" class="grow">
-        <label id="print-layer"></label>
-    </div>
-    <canvas id="print-canvas" width="1440" height="2560"></canvas>
+    <button id="print-sla" class="grow">download</button>
 </div>