diff --git a/src/kiri/worker.js b/src/kiri/worker.js
index d41e5396..2c504c12 100644
--- a/src/kiri/worker.js
+++ b/src/kiri/worker.js
@@ -91,11 +91,43 @@ KIRI.worker = {
 
             widget.mesh = null;
             widget.points = null;
-            widget.loadVertices(widget.vertices);
+
+            // this super ugly hack injects fake support faces
+            // into the widget mesh so they can be rotated and extracted
+            let fv = Array.from(widget.vertices);
+            let fvl = fv.length;
+            let fixed = Object.values(settings.widget[widget.id].support || {});
+            for (let col of fixed) {
+                fv.push(col.x);
+                fv.push(col.y);
+                fv.push(col.z);
+                fv.push(col.x);
+                fv.push(col.y);
+                fv.push(col.z);
+                fv.push(col.x);
+                fv.push(col.y);
+                fv.push(col.z);
+            }
+            let f2l = fv.length;
+            let f32 = fv.toFloat32();
+            // use falsified vertices
+            widget.loadVertices(f32);
+
+            // widget.loadVertices(widget.vertices);
             widget._rotate(rotation,0,0,true);
             widget.center(false, true);
             let bb2 = widget.getBoundingBox(true);
-            widget.belt = { xpos, ypos, zmov: (bb2.max.z - bb1.max.z)/2 };
+
+            // hack part 2: recover rotated support column mid-points
+            for (let i=0; i<fixed.length; i++) {
+                let x = f32[fvl + i*9 + 0];
+                let y = f32[fvl + i*9 + 1];
+                let z = f32[fvl + i*9 + 2];
+                fixed[i].y = y;
+                fixed[i].z = z;
+            }
+
+            widget.belt = { xpos, ypos };
         }
 
         widget.slice(settings, function(error) {
diff --git a/src/mode/fdm/slice.js b/src/mode/fdm/slice.js
index 6bc6aa6c..270fc3c4 100644
--- a/src/mode/fdm/slice.js
+++ b/src/mode/fdm/slice.js
@@ -211,11 +211,6 @@
                 // slices[0].output()
                 //     .setLayer('shadow', { line: 0xff0000, check: 0xff0000 })
                 //     .addPolys(shadow);
-                if (isBelt) {
-                    for (let col of fixed) {
-                        col.z += widget.belt.zmov;
-                    }
-                }
             }
 
             // create shells and diff inner fillable areas
@@ -288,7 +283,7 @@
                 forSlices(0.8, 0.9, slice => {
                     doSupportFill(slice, lineWidth, spro.sliceSupportDensity, minArea);
                 }, "support");
-            } else if (false) {
+            } else if (true) {
                 doSupportBelt(slices, spro, fixed, shadow, doupdate);
             }