Union.skp (229.4 KB)
The attached file represents two walls, adjoining to create a corner. I have tried everything but can not get them to merge and only show their final outline. Instead, they show as two separate entities.
I expect the Tools/Union to create a boolean operation that would make them one properly outlined object. Is this not possible? I have the pro version if that matters.
In order to use Union or any of the other Solid Tools the objects must be identified as solid. Neither of them are in your model because they are missing faces. The selected one is missing faces in the doorway and the other is missing the face at the bottom.