Union Selection box

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How can I make the sleection box not angled on unions?

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I’m pretty sure that’s a normal thing for unions. Although you could try tweaking the Pivot Orientation… I’m just not exactly sure if that’s going to do you any good… but give it a shot anyways and see if that could be the potential solution.

One simple way is to make a negative part in the right orientation but not touching anything and then unioning them together, this should fix the selection box.

The selection box of the Union is the same as the first part selected to create the union.
Try un-unioning, then select a different part, then re-unioning.