diff --git a/src/kiri/worker.js b/src/kiri/worker.js
index d124ddf2..1576d90e 100644
--- a/src/kiri/worker.js
+++ b/src/kiri/worker.js
@@ -175,7 +175,7 @@ KIRI.worker = {
             y: -origin.y,
             z: origin.z
         };
-        const print = KIRI.newPrint(settings, Object.values(cache));
+        const print = current.print = KIRI.newPrint(settings, Object.values(cache));
         const tools = settings.device.extruders;
         const mode = settings.mode;
         const thin = settings.controller.thinRender || mode !== 'FDM';
diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index edb0b9de..1bce5674 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -402,6 +402,11 @@
     };
 
     FDM.prepareRender = function(levels, update, options) {
+        if (levels.length === 0) {
+            self.worker.print.maxSpeed = 0;
+            return [];
+        }
+
         const opts = options || {};
         const tools = opts.tools || {};
         const thin = opts.thin || false;