diff --git a/src/kiri/layers.js b/src/kiri/layers.js
index 0f3c9f98..caa7ec8e 100644
--- a/src/kiri/layers.js
+++ b/src/kiri/layers.js
@@ -232,7 +232,7 @@
                         }
                     }
                 } else {
-                    cur.paths.push({ index, faces, z: poly.getZ() });
+                    cur.paths.push({ index, faces, z: opts.z || poly.getZ() });
                     if (opts.color) {
                         cur.cpath = [ Object.assign({ start: 0, count: Infinity }, opts.color) ];
                     }
diff --git a/src/mode/fdm/client.js b/src/mode/fdm/client.js
index d209722f..46c9e9cd 100644
--- a/src/mode/fdm/client.js
+++ b/src/mode/fdm/client.js
@@ -35,7 +35,7 @@
             restoreSupports(api.widgets.all());
         });
         api.event.on("settings.saved", (settings) => {
-            api.ui.fdmSupport.style.display = lastMode === 'CAM' || settings.device.bedBelt ? 'none' : 'flex';
+            api.ui.fdmSupport.style.display = lastMode !== 'FDM' || settings.device.bedBelt ? 'none' : 'flex';
         });
         api.event.on("button.click", target => {
             switch (target) {
diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index 6bf62b47..f2bc0da7 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -520,14 +520,13 @@
         return currentColorFunction(rate/max, 1, 0.85);
     };
 
-    FDM.prepareRender = function(levels, update, options) {
+    FDM.prepareRender = function(levels, update, opts = {}) {
         levels = levels.filter(level => level.length);
         if (levels.length === 0) {
             self.worker.print.maxSpeed = 0;
             return [];
         }
 
-        const opts = options || {};
         const tools = opts.tools || {};
         const flat = opts.flat;
         const thin = opts.thin && !flat;
@@ -675,6 +674,10 @@
             output
                 .setLayer(opts.other || 'move', moveOpt, opts.moves !== true)
                 .addPolys(moves, { thin: true, z: opts.z });
+            // force level when present
+            if (level.z) {
+                opts.z = level.z;
+            }
             Object.values(prints).forEach(array => {
                 array.forEach(poly => {
                     if (flat && poly.appearsClosed()) {