diff --git a/release.md b/release.md
index 4198441b..40eddca6 100644
--- a/release.md
+++ b/release.md
@@ -26,6 +26,7 @@ Full docs @ https://docs.grid.space/projects/kiri-moto
 * add FDM gcode feature macros for transitions
 * add FDM option to alternate shell winding direction
 * add FDM print time estimate fudge factor for devices
+* add `clear top` option to CNC outline operation
 
 ## Mesh:Tool (1.2.0)
 
diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 57f80bf6..2f39fc98 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -962,7 +962,8 @@ CAM.init = function(kiri, api) {
         omitthru: 'camOutlineOmitThru',
         outside:  'camOutlineOut',
         inside:   'camOutlineIn',
-        wide:     'camOutlineWide'
+        wide:     'camOutlineWide',
+        top:      'camOutlineTop'
     }).inputs = {
         tool:     UC.newSelect(LANG.cc_tool, {}, "tools"),
         sep:      UC.newBlank({class:"pop-sep"}),
@@ -976,7 +977,8 @@ CAM.init = function(kiri, api) {
         inside:   UC.newBoolean(LANG.co_olin_s, undefined, {title:LANG.co_olin_l, show:(op) => { return !op.inputs.outside.checked }}),
         outside:  UC.newBoolean(LANG.co_olot_s, undefined, {title:LANG.co_olot_l, show:(op) => { return !op.inputs.inside.checked }}),
         omitthru: UC.newBoolean(LANG.co_omit_s, undefined, {title:LANG.co_omit_l, xshow:(op) => { return op.inputs.outside.checked }}),
-        wide:     UC.newBoolean(LANG.co_wide_s, undefined, {title:LANG.co_wide_l, show:(op) => { return !op.inputs.inside.checked }})
+        wide:     UC.newBoolean(LANG.co_wide_s, undefined, {title:LANG.co_wide_l, show:(op) => { return !op.inputs.inside.checked }}),
+        top:      UC.newBoolean(LANG.co_clrt_s, undefined, {title:LANG.co_clrt_l}),
     };
 
     createPopOp('contour', {
diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index 13181d7a..1c5a4090 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -420,6 +420,7 @@ class OpOutline extends CamOp {
         let { op, state } = this;
         let { settings, widget, slicer, sliceAll, tshadow, thruHoles, unsafe, color } = state;
         let { updateToolDiams, zThru, zBottom, shadowTop, tabs, cutTabs, cutPolys } = state;
+        let { zMax, ztOff } = state;
         let { process, stock } = settings;
 
         if (op.down <= 0) {
@@ -431,7 +432,11 @@ class OpOutline extends CamOp {
 
         let shadow = [];
         let slices = [];
-        let indices = slicer.interval(op.down, { down: true, min: zBottom, fit: true, off: 0.01 });
+        let intopt = {
+            down: true, min: zBottom, fit: true, off: 0.01,
+            max: op.top ? zMax + ztOff : undefined
+        };
+        let indices = slicer.interval(op.down, intopt);
         let trueShadow = process.camTrueShadow === true;
         // shift out first (top-most) slice
         indices.shift();
@@ -470,6 +475,19 @@ class OpOutline extends CamOp {
         }, genso: true });
         shadow = POLY.union(shadow.appendAll(shadowTop.tops), 0.01, true);
 
+        // start slices at top of stock when `clear top` enabled
+        if (op.top) {
+            let first = slices[0];
+            for (let z of indices.filter(v => v >= zMax)) {
+                console.log({synth: z});
+                let add = first.clone(true);
+                add.tops.forEach(top => top.poly.setZ(add.z));
+                add.shadow = first.shadow.clone(true);
+                add.z = z;
+                slices.splice(0,0,add);
+            }
+        }
+
         // extend cut thru (only when z bottom is 0)
         if (zThru) {
             let last = slices[slices.length-1];
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index c00d6d36..5960081f 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -474,6 +474,8 @@ self.kiri.lang['en-us'] = {
     co_menu:        "outline",
     co_dogb_s:      "dogbones",
     co_dogb_l:      ["insert dogbone cuts","into inside corners"],
+    co_clrt_s:      "clear top",
+    co_clrt_l:      ["cut starting at the top of stock","when stock is enabled"],
     co_wide_s:      "wide cutout",
     co_wide_l:      ["widen outside cutout paths","for deep cuts in hard material"],
     co_olin_s:      "inside only",