diff --git a/src/mode/fdm/prepare.js b/src/mode/fdm/prepare.js
index 70059c2d..059a16a0 100644
--- a/src/mode/fdm/prepare.js
+++ b/src/mode/fdm/prepare.js
@@ -131,6 +131,7 @@
                         speed: speed,
                         mult: extrude,
                     });
+                    layerout.z = zoff + height;
                     layerout.height = height;
                     output.append(layerout);