diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index 9b113b7de8..72ff8aec8c 100644
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -95,7 +95,7 @@ class CuraApplication(QtApplication):
         self._i18n_catalog = None
         self._previous_active_tool = None
         self._platform_activity = False
-        self._scene_boundingbox = AxisAlignedBox()
+        self._scene_boundingbox = AxisAlignedBox.Null
         self._job_name = None
         self._center_after_select = False
         self._camera_animation = None
@@ -283,7 +283,7 @@ class CuraApplication(QtApplication):
                 scene_boundingbox += node.getBoundingBox()
 
         if not scene_boundingbox:
-            scene_boundingbox = AxisAlignedBox()
+            scene_boundingbox = AxisAlignedBox.Null
 
         if repr(self._scene_boundingbox) != repr(scene_boundingbox):
             self._scene_boundingbox = scene_boundingbox
diff --git a/cura/PlatformPhysics.py b/cura/PlatformPhysics.py
index 55cc3652e1..57d8f4e0ba 100644
--- a/cura/PlatformPhysics.py
+++ b/cura/PlatformPhysics.py
@@ -50,8 +50,8 @@ class PlatformPhysics:
 
             bbox = node.getBoundingBox()
 
-            build_volume_bounding_box = copy.deepcopy(self._build_volume.getBoundingBox())
-            build_volume_bounding_box.setBottom(-9001) # Ignore intersections with the bottom
+            # Ignore intersections with the bottom
+            build_volume_bounding_box = self._build_volume.getBoundingBox().set(bottom=-9001)
             node._outside_buildarea = False
 
             # Mark the node as outside the build volume if the bounding box test fails.