diff --git a/src/kiri/widget.js b/src/kiri/widget.js
index db2b9cdd..b1edc150 100644
--- a/src/kiri/widget.js
+++ b/src/kiri/widget.js
@@ -505,6 +505,12 @@
         this.center(false);
     };
 
+    PRO.rotateRaw = function(x, y, z, temp) {
+        this.group.forEach(w => {
+            w._rotate(x, y, z, temp);
+        });
+    };
+
     PRO._rotate = function(x, y, z, temp) {
         if (!temp) {
             this.bounds = null;
diff --git a/src/kiri/worker.js b/src/kiri/worker.js
index d74a5854..9e150342 100644
--- a/src/kiri/worker.js
+++ b/src/kiri/worker.js
@@ -98,10 +98,10 @@ KIRI.worker = {
                 let x = vert[i++];
                 let y = vert[i++];
                 let z = vert[i++];
-                if (z < 0.01) {
+                // if (z < 0.01) {
                     miny = Math.min(miny, y);
                     maxy = Math.max(maxy, y);
-                }
+                // }
             }
             return { miny, maxy };
         }
@@ -116,19 +116,19 @@ KIRI.worker = {
 
         for (let group of Object.values(wgroup)) {
             let { miny, maxy } = gmin(group);
-
             let widget = group[0];
             let track = widget.track;
             let xpos = track.pos.x;
             let ypos = settings.device.bedDepth / 2 + track.pos.y + miny;
             let rotation = (Math.PI / 180) * 45;
-
             // move to accomodate anchor
             ypos += (settings.process.firstLayerBeltLead || 0);
-
-            widget.rotate(rotation,0,0,true);
+            for (let w of group) {
+                w.moveMesh(0, miny, 0);
+            }
+            widget.rotateRaw(rotation,0,0,true);
             let minr = gmin(group);
-            widget.belt = { xpos, ypos, yadd: minr.maxy - minr.miny };
+            widget.belt = { xpos, ypos, yadd: minr.maxy - minr.miny, dy: -miny, dz: 0 };
             for (let others of group.slice(1)) {
                 others.belt = widget.belt;
             }
@@ -146,11 +146,8 @@ KIRI.worker = {
         let rotation = (Math.PI / 180) * 45;
         for (let group of Object.values(wgroup)) {
             let widget = group[0];
-            widget.groupBounds();
-            widget.rotate(-rotation,0,0,true);
-            let { dy, dz } = widget.track.center;
-            widget.groupBounds();
             let { xpos, ypos } = widget.belt;
+            let { dy, dz } = widget.belt;
             // move to accomodate anchor
             dy -= (settings.process.firstLayerBeltLead || 0) ;
             widget.rotinfo = { angle: 45, dy, dz, xpos, ypos };
diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index a7b0b552..30e76e9b 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -305,8 +305,8 @@
                 let o = rotinfo.ypos * beltfact;
                 offset = {
                     x: rotinfo.xpos,
-                    y: o - belt.midy - belt.yadd/2,
-                    z: o,
+                    y: o,
+                    z: o
                 };
                 // offset = { x:0, y:0, z:0 };
                 // locate the lowest point in slices and widget overall
@@ -322,11 +322,6 @@
                         }
                     }
                 }
-                // todo remove b/c this is now calculated at slice time
-                // flag slices as being on or off the bed / belt
-                // for (let slice of widget.slices) {
-                //     slice.onbelt = Math.abs(minby - slice.minby) < 0.01;
-                // }
             } else {
                 // when rafts used this is non-zero
                 offset.z = zoff;
@@ -495,12 +490,6 @@
                 }
             }
 
-            // add lead in, when specified
-            // if (process.firstLayerBeltLead) {
-            //     // add belt lead in
-            //     console.log({process, output});
-            // }
-
             let thresh = firstLayerHeight * 0.25;
             let seqn = 0;
             // iterate over layers, find extrusion on belt and
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 4e73883f..5cca6a72 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -332,8 +332,9 @@
                 // also find max width of first 5 layers
                 let start;
                 let minx = Infinity, maxx = -Infinity;
+                let peek = 0;
                 for (let slice of slices) {
-                    if (slice.index < 5) {
+                    if (slice.groups.length && peek++ < 5) {
                         for (let poly of slice.topPolys()) {
                             minx = Math.min(minx, poly.bounds.minx);
                             maxx = Math.max(maxx, poly.bounds.maxx);