diff --git a/notes.md b/notes.md
index 16d0d45b..8bc02b46 100644
--- a/notes.md
+++ b/notes.md
@@ -14,7 +14,6 @@
 * `F` show slider range values in workspace units (on hover?)
 * `F` allow select of a range by typing in values in slices or workspace units
 * `F` add % field type with conversion (like units)
-* `F` complete G2/G3 arc output / input (85% now)
 * `F` complete and expose grouping feature
 * `F` add svgnest-like arrange algorithm
 
diff --git a/src/kiri/main.js b/src/kiri/main.js
index f5fc830e..17d14547 100644
--- a/src/kiri/main.js
+++ b/src/kiri/main.js
@@ -1059,6 +1059,9 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
             widget.stack = STACKS.create(widget.id, widget.mesh),
                 factor = (widget.getVertices().count / defvert);
 
+            // compensate for zcut (widget moved through floor)
+            widget.stack.obj.view.position.z = widget.track.zcut;
+
             widget.slice(settings, function(sliced, error) {
                 widget.rotinfo = null;
                 let mark = Date.now();
diff --git a/src/kiri/slicer.js b/src/kiri/slicer.js
index 378a3dc8..e147799e 100644
--- a/src/kiri/slicer.js
+++ b/src/kiri/slicer.js
@@ -53,10 +53,20 @@
      */
     function slice(points, bounds, options, ondone, onupdate) {
         let useFlats = options.flats,
+            zCut = options.zCut || 0,
             xray = options.xray,
             ox = 0,
             oy = 0;
 
+        if (zCut) {
+            for (let p of points) {
+                if (!p._z) {
+                    p._z = p.z;
+                    p.z -= zCut;
+                }
+            }
+        }
+
         let zMin = options.zmin || options.firstHeight || Math.floor(bounds.min.z),
             zMax = options.zmax || Math.ceil(bounds.max.z),
             zInc = options.height,
diff --git a/src/kiri/widget.js b/src/kiri/widget.js
index bcfb7f03..b11967cd 100644
--- a/src/kiri/widget.js
+++ b/src/kiri/widget.js
@@ -438,7 +438,6 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
 
     /**
      * moves top of widget to given Z
-     * used in CAM mode
      *
      * @param {number} z position
      */
@@ -453,7 +452,7 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
             this.track.top = z;
         } else {
             pos.z = 0;
-            mesh.position.z = 0;
+            mesh.position.z = -this.track.zcut || 0;
             this.track.top = mbz;
         }
         let ntz = {
@@ -462,7 +461,12 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
         };
         this.modified |= (ltz.pz !== ntz.pz || ltz.mpz !== ntz.mpz);
         this.last_top_z = ntz;
-    }
+    };
+
+    PRO.cutZ = function(dist) {
+        this.track.zcut = dist;
+        this.setTopZ();
+    };
 
     PRO.move = function(x, y, z, abs) {
         this.group.forEach(w => {
@@ -472,11 +476,12 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
 
     PRO._move = function(x, y, z, abs) {
         let mesh = this.mesh,
-            pos = this.track.pos;
-        // do not allow moves in pure slice view
+            pos = this.track.pos,
+            zcut = this.track.zcut || 0;
+            // do not allow moves in pure slice view
         if (!mesh.material.visible) return;
         if (abs) {
-            mesh.position.set(x,y,z);
+            mesh.position.set(x, y, z - zcut);
             pos.x = (x || 0);
             pos.y = (y || 0);
             pos.z = (z || 0);
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 8a8f09a9..a7a33904 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -178,6 +178,7 @@
 
         SLICER.sliceWidget(widget, {
             mode: 'FDM',
+            zCut: widget.track.zcut || 0,
             height: sliceHeight,
             minHeight: sliceMinHeight,
             firstHeight: sliceHeightBase,