diff --git a/src/kiri-mode/cam/export.js b/src/kiri-mode/cam/export.js
index 6f825ab1..a8772cfd 100644
--- a/src/kiri-mode/cam/export.js
+++ b/src/kiri-mode/cam/export.js
@@ -371,7 +371,7 @@ CAM.export = function(print, online) {
         append(`; Generated by Kiri:Moto ${kiri.version}`);
         append(`; ${new Date().toString()}`);
         filterEmit(["; Bed left:{left} right:{right} top:{top} bottom:{bottom}"], consts);
-        append(`; Stock X:${stock.x.round(2)} Y:${stock.y.round(2)} Z:${stock.z.round(2)}`);
+        append(`; Stock X:${stock.x?.round(2)} Y:${stock.y?.round(2)} Z:${stock.z?.round(2)}`);
         append(`; Target: ${settings.filter[settings.mode]}`);
         append("; --- process ---");
         for (let pk in spro) {
diff --git a/src/kiri-mode/cam/prepare.js b/src/kiri-mode/cam/prepare.js
index e5c9cbe9..8e141aae 100644
--- a/src/kiri-mode/cam/prepare.js
+++ b/src/kiri-mode/cam/prepare.js
@@ -79,12 +79,12 @@ function prepEach(widget, settings, print, firstPoint, update) {
         bounds = widget.getBoundingBox(),
         boundsz = isIndexed ? stock.z / 2 : bounds.max.z + ztOff,
         zadd = !isIndexed ? stock.z - boundsz : alignTop ? outerz - boundsz : 0,
-        zmax = outerz + zclear + process.camOriginOffZ,
+        zmax = outerz + zclear + (process.camOriginOffZ || 0),
         wmpos = widget.track.pos,
         wmx = wmpos.x,
         wmy = wmpos.y,
-        originx = (startCenter ? 0 : -stock.x / 2) + process.camOriginOffX,
-        originy = (startCenter ? 0 : -stock.y / 2) + process.camOriginOffY,
+        originx = (startCenter ? 0 : -stock.x / 2) + (process.camOriginOffX || 0),
+        originy = (startCenter ? 0 : -stock.y / 2) + (process.camOriginOffY || 0),
         origin = newPoint(originx + wmx, originy + wmy, zmax),
         output = print.output,
         easeDown = process.camEaseDown,
diff --git a/src/kiri-run/engine.js b/src/kiri-run/engine.js
index 17e9ed07..d0350a17 100644
--- a/src/kiri-run/engine.js
+++ b/src/kiri-run/engine.js
@@ -8,6 +8,7 @@
 // dep: kiri.client
 // dep: kiri.widget
 // use: add.three
+// use: add.array
 gapp.register("kiri-run.engine", [], (root, exports) => {
 
 const { kiri } = root;
@@ -105,10 +106,19 @@ class Engine {
     }
 
     setStock(stock) {
-        this.settings.stock = stock;
+        let { settings } = this;
+        let { process } = settings;
+        settings.stock = stock;
+        process.camStockX = stock.x;
+        process.camStockY = stock.y;
+        process.camStockZ = stock.z;
         return this;
     }
 
+    setOrigin(x, y, z) {
+        this.settings.origin = { x, y, z };
+        return this;
+    }
 
     moveTo(x, y, z) {
         this.widget.move(x, y, z, true);