diff --git a/src/kiri/stacks.js b/src/kiri/stacks.js
index ee246d85..353167c3 100644
--- a/src/kiri/stacks.js
+++ b/src/kiri/stacks.js
@@ -137,7 +137,7 @@
                     group.add(new THREE.LineSegments(geo, mat));
                 }
                 geo.setFromPoints(vert);
-                ctrl.group.push(mat);
+                ctrl.group.appendAll(mat);
             }
             if (faces.length) {
                 const mat = newMat(data);
diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index d78ab7eb..8f0dc52c 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -420,13 +420,17 @@
                     return;
                 }
                 if (lastOut) {
+                    const op = out.point, lp = lastOut.point,
+                        moved = (op.x !== lp.x) || (op.y !== lp.y) || (op.z !== lp.z);;
                     if (out.emit) {
+                        // if (!moved) return;
                         if (!lastOut.emit || (ckspeed && out.speed !== lastOut.speed)) {
                             current = newPolygon().setOpen();
                             current.push(lastOut.point);
                             current.color = hsv2rgb({h:out.speed/maxspd, s:1, v:1}, true);
                             pushPrint(out.tool, current);
                         }
+                        // current.color = hsv2rgb({h:out.speed/maxspd, s:1, v:1}, true);
                         current.push(out.point);
                     } else {
                         if (lastOut.emit) {