diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index a4928e0b..54a1f05c 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -1263,6 +1263,7 @@ CAM.init = function(kiri, api) {
         rate:    'camRoughSpeed',
         plunge:  'camRoughPlunge',
         leave:   'camRoughStock',
+        leavez:  'camRoughStockZ',
         all:     'camRoughAll',
         voids:   'camRoughVoid',
         flats:   'camRoughFlat',
@@ -1278,6 +1279,7 @@ CAM.init = function(kiri, api) {
         down:    UC.newInput(LANG.cc_sdwn_s, {title:LANG.cc_sdwn_l, convert:UC.toFloat, units:true}),
         step:    UC.newInput(LANG.cc_sovr_s, {title:LANG.cc_sovr_l, convert:UC.toFloat, bound:UC.bound(0.01,1.0)}),
         leave:   UC.newInput(LANG.cr_lsto_s, {title:LANG.cr_lsto_l, convert:UC.toFloat, units:true}),
+        leavez:  UC.newInput(LANG.cr_lstz_s, {title:LANG.cr_lstz_l, convert:UC.toFloat, bound:UC.bound(0,10),units:true}),
         sep:     UC.newBlank({class:"pop-sep"}),
         all:     UC.newBoolean(LANG.cr_clst_s, undefined, {title:LANG.cr_clst_l, show:hasIndexing}),
         voids:   UC.newBoolean(LANG.cr_clrp_s, undefined, {title:LANG.cr_clrp_l}),
diff --git a/src/kiri-mode/cam/ops.js b/src/kiri-mode/cam/ops.js
index b8d1b2b4..86181944 100644
--- a/src/kiri-mode/cam/ops.js
+++ b/src/kiri-mode/cam/ops.js
@@ -182,7 +182,8 @@ class OpRough extends CamOp {
         let roughIn = op.inside;
         let roughTop = op.top;
         let roughDown = op.down;
-        let roughLeave = op.leave;
+        let roughLeave = op.leave || 0;
+        let roughLeaveZ = op.leavez || 0;
         let roughStock = op.all && isIndexed;
         let toolDiam = new CAM.Tool(settings, op.tool).fluteDiameter();
         let trueShadow = process.camTrueShadow === true;
@@ -210,7 +211,7 @@ class OpRough extends CamOp {
             for (let z = zstart; zsteps > 0; zsteps--) {
                 let slice = shadowTop.slice.clone(false);
                 slice.z = z;
-                slice.camLines = POLY.setZ(facing.clone(true), slice.z);
+                slice.camLines = POLY.setZ(facing.clone(true), slice.z + roughLeaveZ);
                 slice.output()
                     .setLayer("face", {face: color, line: color})
                     .addPolys(slice.camLines);
@@ -383,10 +384,10 @@ class OpRough extends CamOp {
             });
 
             slice.camLines = offset;
-            if (roughLeave) {
+            if (roughLeaveZ) {
                 // offset roughing in Z as well to minimize
                 // tool marks on curved surfaces
-                const roughLeaveZ = 1 * Math.min(roughDown, roughLeave / 2);
+                // const roughLeaveZ = 1 * Math.min(roughDown, roughLeave / 2);
                 slice.camLines.forEach(p => {
                     p.setZ(p.getZ() + roughLeaveZ);
                 });
@@ -409,7 +410,7 @@ class OpRough extends CamOp {
             let add = last.clone(true);
             add.z -= zneg;
             add.camLines = last.camLines.clone(true);
-            add.camLines.forEach(p => p.setZ(add.z));
+            add.camLines.forEach(p => p.setZ(add.z + roughLeaveZ));
             // add.tops.forEach(top => top.poly.setZ(add.z));
             // add.shadow = last.shadow.clone(true);
             slices.push(add);
diff --git a/src/kiri/conf.js b/src/kiri/conf.js
index c8fa22b7..dc75c7b5 100644
--- a/src/kiri/conf.js
+++ b/src/kiri/conf.js
@@ -470,6 +470,7 @@ const conf = exports({
                 camRoughSpeed: 1000,
                 camRoughPlunge: 250,
                 camRoughStock: 0,
+                camRoughStockZ: 0,
                 camRoughAll: true,
                 camRoughVoid: false,
                 camRoughFlat: true,
diff --git a/web/kiri/lang/en.js b/web/kiri/lang/en.js
index 53c45287..7097ea73 100644
--- a/web/kiri/lang/en.js
+++ b/web/kiri/lang/en.js
@@ -481,6 +481,8 @@ self.kiri.lang['en-us'] = {
     cr_menu:        "rough",
     cr_lsto_s:      "leave stock",
     cr_lsto_l:      ["horizontal offset from vertical faces","stock to leave for finishing pass","in workspace units"],
+    cr_lstz_s:      "leave stock z",
+    cr_lstz_l:      ["vertical offset for roughing passes in workspace units. best for roughing curved surfaces."],
     cr_ease_s:      "ease down",
     cr_ease_l:      ["plunge cuts will","spiral down or ease","along a linear path"],
     cr_clst_s:      "clear stock",