Boolean does not work

I tried to cut a whole into a cube but the other half of the whole unites with the cube, even if the cubes are manifold. It just does not work correctly.

If you need more information just ask please. Thank you.

Booleans work on “volume”. One of your boxes has infinitely thin zero volume walls because you deleted the top.

You can put a solidify modifier above the boolean modifier.

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Thank you for your answer. I made the walls a bit thicker (0.1), but it still does not work.It seems to appear an additional wall around the inner half of the “cutting cube” (see gif).

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Thank you, that worked finde. But don’t I need to remove the cutting cube instead of just hiding it?

It depends, a lot of people like to leave the modifer un-applied as this allows you to make changes later down the road. It is also a less destructive workflow.

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Thank you all!

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Also if you look at stuff like hard-ops and box cutter and decal machine their entire workflow is around dozens of boolean modifiers that never get applied.

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