diff --git a/src/kiri/print.js b/src/kiri/print.js
index 473dd722..ea63a35b 100644
--- a/src/kiri/print.js
+++ b/src/kiri/print.js
@@ -113,6 +113,7 @@
             seq = [],
             abs = true,
             move = false,
+            height = 0,
             factor = 1,
             tool = 0,
             E0G0 = false,
@@ -121,9 +122,11 @@
                 if (seq.length > 0) {
                     output.push(seq);
                     seq = [];
+                    seq.height = height;
                 }
             },
             LZ = 0.0,
+            LMZ = 0.0,
             pos = {
                 X: 0.0,
                 Y: 0.0,
@@ -184,6 +187,9 @@
                     if (E0G0 && pos.E === 0.0) {
                         if (LZ != pos.Z) G0();
                         else move = true;
+                        if (move && pos.Z > LMZ) {
+                            height = seq.height = pos.Z - LMZ;
+                        }
                     }
                     addOutput(
                         seq,
@@ -203,6 +209,7 @@
             move = false;
             pos.E = 0.0;
             LZ = pos.Z;
+            LMZ = Math.max(LZ, LMZ);
         });
 
         G0();
@@ -211,7 +218,7 @@
         scope.lines = lines.length;
         scope.bytes = gcode.length;
 
-        done(scope.output);
+        done({ output: scope.output });
     };
 
     function pref(a,b) {
diff --git a/src/kiri/stacks.js b/src/kiri/stacks.js
index 62245982..48893a92 100644
--- a/src/kiri/stacks.js
+++ b/src/kiri/stacks.js
@@ -95,7 +95,6 @@
 
         for (const [label, data] of Object.entries(render.layers)) {
             if (!DYN[label]) {
-console.log('new label', label);
                 DYN[label] = {
                     group: [],
                     toggle: UC.newBoolean(label, (abc) => {
diff --git a/src/kiri/worker.js b/src/kiri/worker.js
index 3cacad45..21075f1b 100644
--- a/src/kiri/worker.js
+++ b/src/kiri/worker.js
@@ -163,13 +163,15 @@ KIRI.worker = {
             z: origin.z
         };
         const print = KIRI.newPrint(settings, Object.values(cache));
+        const tools = settings.device.extruders;
+        const thin = settings.controller.thinRender || settings.mode !== 'FDM';
 
         const parsed = print.parseGCode(code, offset, progress => {
-            send.data({progress});
+            send.data({ progress: progress * 0.5 });
         }, done => {
-            const layers = KIRI.driver.FDM.prepareRender(done, progress => {
-                send.data({progress});
-            }, { thin: true });
+            const layers = KIRI.driver.FDM.prepareRender(done.output, progress => {
+                send.data({ progress: 0.5 + progress * 0.5 });
+            }, { thin, tools });
             send.done({parsed: KIRI.codec.encode(layers)});
         });
     },