diff --git a/package.json b/package.json
index 700ab8b6..a0b67cd1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "grid-apps",
-    "version": "3.8.13D",
+    "version": "3.8.14D",
     "description": "grid.space 3d slice & modeling tools",
     "author": "Stewart Allen <sa@grid.space>",
     "license": "MIT",
diff --git a/release.md b/release.md
index 9ad6ee95..b40df653 100644
--- a/release.md
+++ b/release.md
@@ -27,6 +27,7 @@ Full docs @ https://docs.grid.space/projects/kiri-moto
 * CAM add omit pocket option to outline op
 * CAM add trace support for taper tip diameter
 * CAM add trace offset override
+* CAM add leave stock to contour
 
 
 # Release 3.7 (2022-11-12)
diff --git a/src/kiri-mode/cam/animate.js b/src/kiri-mode/cam/animate.js
index ec2f496a..13d57a71 100644
--- a/src/kiri-mode/cam/animate.js
+++ b/src/kiri-mode/cam/animate.js
@@ -382,6 +382,7 @@ kiri.load(() => {
     let renderSpeed = 0;
     let skipMove = null;
     let toolUpdate;
+    let depth = 0;
 
     // send latest tool position and progress bar
     function renderUpdate(send) {
@@ -488,8 +489,8 @@ kiri.load(() => {
             deformMesh(pos, send);
             toolUpdate = { mesh_move: { id, pos }};
             // pause renderer at specified offsets
-            if (renderSpeed && renderDist >= renderSpeed) {
-                renderDist = 0;
+            if ((renderSpeed && renderDist >= renderSpeed) || (depth > 600)) {
+                renderDist = depth = 0;
                 renderUpdate(send);
                 setTimeout(() => {
                     renderMoves(id, moves, send, index);
@@ -497,6 +498,7 @@ kiri.load(() => {
                 return;
             }
         }
+        depth++;
         renderPath(send);
     }
 
diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index d9681ea7..405701c4 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -1295,6 +1295,7 @@ CAM.init = function(kiri, api) {
         step:      'camContourOver',
         rate:      'camContourSpeed',
         angle:     'camContourAngle',
+        leave:     'camContourLeave',
         tolerance: 'camTolerance',
         flatness:  'camFlatness',
         bridging:  'camContourBridge',
@@ -1311,6 +1312,7 @@ CAM.init = function(kiri, api) {
         sep:       UC.newBlank({class:"pop-sep"}),
         step:      UC.newInput(LANG.cc_sovr_s, {title:LANG.cc_sovr_l, convert:UC.toFloat, bound:UC.bound(0.01,2.0)}),
         angle:     UC.newInput(LANG.cf_angl_s, {title:LANG.cf_angl_l, convert:UC.toFloat, bound:UC.bound(45,90)}),
+        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"}),
         flatness:  UC.newInput(LANG.ou_flat_s, {title:LANG.ou_flat_l, convert:UC.toFloat, bound:UC.bound(0,1.0), units:true, round:4}),
         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}),
diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index 329d5ba5..f6db3dac 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -658,7 +658,7 @@ class OpOutline extends CamOp {
 
         // project empty up and render
         for (let slice of slices) {
-            if (true) slice.output()
+            if (false) slice.output()
                 .setLayer("slice", {line: 0xaaaa00}, false)
                 .addPolys(slice.topPolys())
             slice.output()
diff --git a/src/kiri-mode/cam/topo.js b/src/kiri-mode/cam/topo.js
index 1605e5aa..c57faa32 100644
--- a/src/kiri-mode/cam/topo.js
+++ b/src/kiri-mode/cam/topo.js
@@ -36,7 +36,7 @@ class Topo {
             contourY = axis === "y",
             bounds = widget.getBoundingBox().clone(),
             tolerance = contour.tolerance,
-            flatness = contour.flatness || 0.001,
+            flatness = contour.flatness || (tolerance / 100),
             shadow = tshadow,
             minX = bounds.min.x,
             maxX = bounds.max.x,
@@ -53,6 +53,7 @@ class Topo {
             toolDiameter = tool.fluteDiameter(),
             toolStep = toolDiameter * contour.step,
             traceJoin = toolDiameter / 2,
+            leave = contour.leave || 0,
             maxangle = contour.angle,
             curvesOnly = contour.curves,
             bridge = contour.bridging || 0,
@@ -180,6 +181,7 @@ class Topo {
             clipTab,
             tabHeight,
             newslices,
+            leave,
             color
         }, (i, l, p) => {
             onupdate(l / 2 + i / 2, l, p);
@@ -302,7 +304,7 @@ class Topo {
 
         const { minX, maxX, minY, maxY, boundsX, boundsY, stepsX, stepsY } = params;
         const { gridDelta, resolution, partOff, toolStep, contourX, contourY } = params;
-        const { clipTo, clipTab, tabHeight, newslices, color } = params;
+        const { clipTo, clipTab, tabHeight, newslices, color, leave } = params;
 
         let stepsTaken = 0,
             stepsTotal = 0;
@@ -325,6 +327,7 @@ class Topo {
 
         trace.init({
             box,
+            leave,
             clipTo,
             clipTab,
             tabHeight,
@@ -474,7 +477,7 @@ class Trace {
 
     constructor(probe, params) {
 
-        const { curvesOnly, maxangle, flatness, bridge, contourX } = params;
+        const { curvesOnly, maxangle, flatness, bridge, contourX, leave } = params;
 
         this.params = params;
         this.probe = probe;
@@ -609,7 +612,7 @@ class Trace {
 
     crossY_sync(params, then) {
         const { push_point, end_poly, newtrace, newslice, inClip } = this.object;
-        const { clipTab, tabHeight, clipTo, box, resolution } = this.cross;
+        const { clipTab, tabHeight, clipTo, box, resolution, leave } = this.cross;
         const { toolAtZ } = this.probe;
         let { from, to, x, gridx, gridy } = params;
         const checkr = newPoint(0,0);
@@ -636,7 +639,7 @@ class Trace {
                 gridy++;
                 continue;
             }
-            push_point(x, y, tv);
+            push_point(x, y, tv + leave);
             gridy++;
         }
         end_poly();
@@ -645,9 +648,10 @@ class Trace {
 
     crossX_sync(params, then) {
         const { push_point, end_poly, newtrace, newslice, inClip } = this.object;
-        const { clipTab, tabHeight, clipTo, box, resolution } = this.cross;
+        const { clipTab, tabHeight, clipTo, box, resolution, leave } = this.cross;
         const { toolAtZ } = this.probe;
         let { from, to, y, gridx, gridy } = params;
+
         const checkr = newPoint(0,0);
         newslice();
         newtrace();
@@ -672,7 +676,7 @@ class Trace {
                 gridx++;
                 continue;
             }
-            push_point(x, y, tv);
+            push_point(x, y, tv + leave);
             gridx++;
         }
         end_poly();
diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index 92c10422..5476155c 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -493,6 +493,7 @@ const conf = exports({
                 camContourOver: 0.5,
                 camContourSpeed: 1000,
                 camContourAngle: 85,
+                camContourLeave: 0,
                 camContourBottom: false,
                 camContourCurves: false,
                 camContourIn: false,
diff --git a/src/main/kiri.js b/src/main/kiri.js
index 43042105..1028dbd2 100644
--- a/src/main/kiri.js
+++ b/src/main/kiri.js
@@ -15,7 +15,7 @@ gapp.main("main.kiri", [], (root) => {
     const modfns = root.kirimod = ( root.kirimod || [] );
 
     const kiri = root.kiri = {
-        beta: 3813,
+        beta: 3814,
         driver: {}, // driver modules
         load(fn) {
             modfns.push(fn);
diff --git a/src/moto/license.js b/src/moto/license.js
index c59c96e1..92570433 100644
--- a/src/moto/license.js
+++ b/src/moto/license.js
@@ -5,7 +5,7 @@
     let terms = {
         COPYRIGHT: "Copyright (C) Stewart Allen <sa@grid.space> - All Rights Reserved",
         LICENSE: "See the license.md file included with the source distribution",
-        VERSION: (is_self ? self : this).debug_version || "3.8.D13"
+        VERSION: (is_self ? self : this).debug_version || "3.8.D14"
     };
 
     if (typeof(module) === 'object') {
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 332d41bd..456547ba 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -510,6 +510,8 @@ self.kiri.lang['en-us'] = {
     cn_menu:        "contour",
     cf_angl_s:      "max angle",
     cf_angl_l:      ["angles greater than this","are considered vertical"],
+    cf_leav_s:      "leave stock",
+    cf_leav_l:      ["amount of stock to leave above part surface"],
     cf_botm_s:      "z bottom",
     cf_botm_l:      ["obey z bottom limit"],
     cf_curv_s:      "curves only",