diff --git a/notes.md b/notes.md
index b7e7a9a1..7cf2186c 100644
--- a/notes.md
+++ b/notes.md
@@ -33,8 +33,6 @@
 
 * `F` new parameter to cap output flow rate (on printer device)
 * `F` new parameters for bridging speed / bridge fan control
-* `F` new base paremeter for hole and perimeter compensation
-* `F` new parameters for inner / outer perimeter compensation
 * `F` convert ranges to z offsets while continuing to show layer #
 * `F` support pillar top/bottom should conform to part
 * `F` more explicit line width control with ranges and min/max adaptive
diff --git a/src/kiri/core/api.js b/src/kiri/core/api.js
index c66292a3..42ec035c 100644
--- a/src/kiri/core/api.js
+++ b/src/kiri/core/api.js
@@ -96,6 +96,7 @@ let UC = UI.prefix('kiri').inputAction(settings.conf.update),
         put: (key, val) => localSet(key, val),
         set: (key, val) => localSet(key, val),
         setItem: (key, val) => localSet(key, val),
+        removeItem: (key) => localRemove(key)
     },
     tweak = {
         line_precision(v) { api.work.config({ base: { clipperClean: v } }) },
@@ -119,6 +120,11 @@ function localSet(key, val) {
     return val;
 }
 
+function localRemove(key) {
+    let sloc = api.conf.get().local;
+    return delete sloc[key];
+}
+
 export const api = {
     ajax,
     beta,
diff --git a/src/kiri/core/conf.js b/src/kiri/core/conf.js
index 4daf5556..71908b54 100644
--- a/src/kiri/core/conf.js
+++ b/src/kiri/core/conf.js
@@ -267,6 +267,8 @@ export const conf = {
                 sliceLayerStartX: 0,
                 sliceLayerStartY: 0,
                 sliceLineWidth: 0,
+                sliceCompInner: 0,
+                sliceCompOuter: 0,
                 sliceFillGrow: 0,
                 sliceFillAngle: 45,
                 sliceFillWidth: 1,
diff --git a/src/kiri/core/widget.js b/src/kiri/core/widget.js
index 783598ca..47222eb7 100644
--- a/src/kiri/core/widget.js
+++ b/src/kiri/core/widget.js
@@ -782,9 +782,11 @@ class Widget {
         }
         if (set) {
             let dark = this.api.space.is_dark();
+            let cam = this.api.mode.is_cam();
+            let color = dark && !cam ? 0xffffff : 0;
             let angle = this.api.conf.get().controller.edgeangle || 20;
             let edges = new THREE.EdgesGeometry(mesh.geometry, angle);
-            let material = new THREE.LineBasicMaterial({ color: 0 });
+            let material = new THREE.LineBasicMaterial({ color });
             this.outline = new THREE.LineSegments(edges, material);
             this.outline.renderOrder = -20;
             mesh.add(this.outline);
diff --git a/src/kiri/mode/fdm/init-menu.js b/src/kiri/mode/fdm/init-menu.js
index fc0506c1..07571f0b 100644
--- a/src/kiri/mode/fdm/init-menu.js
+++ b/src/kiri/mode/fdm/init-menu.js
@@ -181,6 +181,8 @@ export function menu() {
     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)}),
     outputCoastDist:     newInput(LANG.ad_scst_s, {title:LANG.ad_scst_l, convert:toFloat, bound:bound(0.0,10)}),
+    sliceCompInner:      newInput(LANG.sl_ofin_s, {title:LANG.sl_ofin_l, convert:toFloat, bound:bound(-10.0,10.0)}),
+    sliceCompOuter:      newInput(LANG.sl_ofot_s, {title:LANG.sl_ofot_l, convert:toFloat, bound:bound(-10.0,10.0)}),
     zHopDistance:        newInput(LANG.ad_zhop_s, {title:LANG.ad_zhop_l, convert:toFloat, bound:bound(0,3.0)}),
     outputLoops:         newInput(LANG.ag_loop_s, {title:LANG.ag_loop_l, convert:toInt,   bound:bound(-1,1000), show:isBelt}),
 
diff --git a/src/kiri/mode/fdm/post.js b/src/kiri/mode/fdm/post.js
index 25cd368e..b910958a 100644
--- a/src/kiri/mode/fdm/post.js
+++ b/src/kiri/mode/fdm/post.js
@@ -17,12 +17,13 @@ slicer.slicePost.FDM = slicePost;
  * data object. return is ignored.
  */
 export function slicePost(data, options) {
-    const { z, lines, groups } = data;
-    const { useAssembly, post_args, zIndexes } = options;
-    const { process, isSynth, vaseMode } = post_args;
-    const { shellOffset, fillOffset, clipOffset } = post_args;
+    const { groups, z } = data;
+    const { post_args, useAssembly, zIndexes } = options;
+    const { isSynth, process, vaseMode } = post_args;
+    const { compInner, compOuter, pump } = post_args;
+    const { clipOffset, fillOffset, shellOffset  } = post_args;
 
-    if (options.pump) {
+    if (pump) {
         let nugroups = [];
         let pump = shellOffset / 10;
         for (let p of groups) {
@@ -41,6 +42,19 @@ export function slicePost(data, options) {
         data.tops = POLY.nest(groups);
     }
 
+    // perimeter and inner hole compensation offsets
+    if (compInner || compOuter) {
+        let inner = POLY.inner(data.tops).flat();
+        let outer = POLY.outer(data.tops);
+        if (compInner) {
+            inner = POLY.flatten(POLY.offset(inner, compInner/2));
+        }
+        if (compOuter) {
+            outer = POLY.flatten(POLY.offset(outer, -compOuter/2));
+        }
+        data.tops = POLY.nest([...inner, ...outer]);
+    }
+
     if (isSynth) {
         const process = post_args.process;
         if (process.sliceSupportGrow > 0) {
@@ -54,6 +68,7 @@ export function slicePost(data, options) {
         delete data.groups;
         return;
     }
+
     const index = zIndexes.indexOf(z);
     const range = getRangeParameters(process, index);
     // calculate fractional shells
@@ -129,7 +144,7 @@ function offset_default(params) {
     }
 
     const deltaBig = 160;
-    const deltSmall = 20;
+    const deltaSmall = 20;
 
     // look for close points on adjacent segmented polys and merge
     let test_polys = first !== last ? [ ...first, ...last ] : last;
@@ -139,6 +154,8 @@ function offset_default(params) {
     for (let poly of test_flats)
     poly.forEachSegment((p0, p1) => {
         p0.angle = new Slope(p0, p1);
+        // todo calc vertex angle
+        // exclude segment vertex from merge when angle < deltaSmall
     });
 
     // segment each poly to be tested
diff --git a/src/kiri/mode/fdm/slice.js b/src/kiri/mode/fdm/slice.js
index bc91bb0e..9bda3df8 100644
--- a/src/kiri/mode/fdm/slice.js
+++ b/src/kiri/mode/fdm/slice.js
@@ -140,7 +140,8 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
         fillOffset = lineWidth * fillOffsetMult,
         clipOffset = process.sliceSupportOffset,
         sliceFillAngle = process.sliceFillAngle,
-        supportDensity = process.sliceSupportDensity;
+        supportDensity = process.sliceSupportDensity,
+        { sliceCompInner, sliceCompOuter } = process;
 
     // override globals used by vopt()
     isFlat = controller.lineType === "flat";
@@ -230,6 +231,8 @@ export function fdm_slice(settings, widget, onupdate, ondone) {
         useAssembly,
         post: 'FDM',
         post_args: {
+            compInner: sliceCompInner,
+            compOuter: sliceCompOuter,
             shellOffset,
             fillOffset,
             clipOffset,
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 451bcadb..39eb200d 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -362,6 +362,10 @@ self.lang['en-us'] = {
     sl_ordr_l:      ["output shell order","inside to outside","or outside to inside","affects surface quality"],
     sl_strt_s:      "start point",
     sl_strt_l:      ["layer starting point","last = where last layer ended","center = part center","origin = device origin","random = yolo"],
+    sl_ofin_s:      "shell inner offset",
+    sl_ofin_l:      ["inner hole perimeter offset","in millimeters"],
+    sl_ofot_s:      "shell outer offset",
+    sl_ofot_l:      ["outer wall perimeter offset","in millimeters"],
 
     // FDM SOLID
     fs_menu:        "solid fill",