diff --git a/cura/BuildVolume.py b/cura/BuildVolume.py
index 4963df65cd..33927c4a98 100755
--- a/cura/BuildVolume.py
+++ b/cura/BuildVolume.py
@@ -677,7 +677,7 @@ class BuildVolume(SceneNode):
         for extruder in used_extruders:
             prime_blob_enabled = extruder.getProperty("prime_blob_enable", "value")
             prime_x = extruder.getProperty("extruder_prime_pos_x", "value")
-            prime_y = - extruder.getProperty("extruder_prime_pos_y", "value")
+            prime_y = -extruder.getProperty("extruder_prime_pos_y", "value")
 
             #Ignore extruder prime position if it is not set or if blob is disabled
             if (prime_x == 0 and prime_y == 0) or not prime_blob_enabled:
@@ -727,7 +727,7 @@ class BuildVolume(SceneNode):
             offset_x = extruder.getProperty("machine_nozzle_offset_x", "value")
             if offset_x is None:
                 offset_x = 0
-            offset_y = extruder.getProperty("machine_nozzle_offset_y", "value")
+            offset_y = -extruder.getProperty("machine_nozzle_offset_y", "value")
             if offset_y is None:
                 offset_y = 0
             result[extruder_id] = []
@@ -746,7 +746,7 @@ class BuildVolume(SceneNode):
                 #The build volume is defined as the union of the area that all extruders can reach, so we need to know the relative offset to all extruders.
                 for other_extruder in ExtruderManager.getInstance().getActiveExtruderStacks():
                     other_offset_x = other_extruder.getProperty("machine_nozzle_offset_x", "value")
-                    other_offset_y = other_extruder.getProperty("machine_nozzle_offset_y", "value")
+                    other_offset_y = -other_extruder.getProperty("machine_nozzle_offset_y", "value")
                     left_unreachable_border = min(left_unreachable_border, other_offset_x - offset_x)
                     right_unreachable_border = max(right_unreachable_border, other_offset_x - offset_x)
                     top_unreachable_border = min(top_unreachable_border, other_offset_y - offset_y)