CURA-13036 Ensure build volume initialized before arrange

cura/BuildVolume.py

@@ -139,6 +139,10 @@ def __init__(self, application: "CuraApplication", parent: Optional[SceneNode] =
         # Therefore this works.
         self._machine_manager.activeQualityChanged.connect(self._onStackChanged)
 
+        # Explicitly queue the timer here so _onStackChangeTimerFinished always runs once
+        # after construction to populate the dimensions regardless of signal ordering.
+        self._onStackChanged()
+
         # Enable and disable extruder
         self._machine_manager.extruderChanged.connect(self.updateNodeBoundaryCheck)
 
@@ -699,6 +703,10 @@ def _onStackChangeTimerFinished(self) -> None:
     def _onEngineCreated(self) -> None:
         self._engine_ready = True
         self.rebuild()
+        if self._volume_aabb is None:
+            # rebuild() returned early. Re-queue it so dimensions are fetched and rebuild() is retried after a short delay.
+            Logger.warning("BuildVolume: _volume_aabb is still None after engine created; re-triggering stack refresh.")
+            self._onStackChanged()
 
     def _onSettingChangeTimerFinished(self) -> None:
         if not self._global_container_stack:

cura/CuraApplication.py

@@ -1589,7 +1589,13 @@ def _arrangeAll(self, *, grid_arrangement: bool) -> None:
             if node.callDecoration("getBuildPlateNumber") == active_build_plate:
                 # Skip nodes that are too big
                 bounding_box = node.getBoundingBox()
-                if bounding_box is None or bounding_box.width < self._volume.getBoundingBox().width or bounding_box.depth < self._volume.getBoundingBox().depth:
+                volume_bounding_box = self._volume.getBoundingBox()
+                if volume_bounding_box is None:
+                    Logger.warning("_arrangeAll: build volume bounding box is None — rebuild not yet triggered. Requesting rebuild and aborting arrange.")
+                    # Trigger a rebuild now and bail out; the user can retry arrange once the volume is ready.
+                    self._volume.rebuild()
+                    return
+                if bounding_box is None or bounding_box.width < volume_bounding_box.width or bounding_box.depth < volume_bounding_box.depth:
                     # Arrange only the unlocked nodes and keep the locked ones in place
                     if node.getSetting(SceneNodeSettings.LockPosition):
                         locked_nodes.append(node)