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I have two cubes. One is 6x6x6 and the other one is 4x4x4. I am careful to ensure that the normals are properly facing outward and that the scale and location has been applied. Yet no matter what I try and do, the boolean union seems to fail.

boolean error

What am I doing wrong?

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  • $\begingroup$ Your bottom faces seem coinciding, Booleans don't like coplanar faces, it can't figure out what way is in what is out. $\endgroup$ – Duarte Farrajota Ramos May 2 '17 at 3:53
  • $\begingroup$ Ok it was failing when I used the BMesh solver. When i switched to carve it worked fine. So frustrating! LOL $\endgroup$ – user38409 May 2 '17 at 4:39
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To make the boolean operations produce a clean topology use a BoolTool add on. Download it from the net and activate it via User Preferences (Ctrl+Alt+U). enter image description here

Select the first cube, then the second one, go to the BoolTool bookmark of the Tool Shelf (T) and press the Union button (under the Direct header). I suggest you to use this add on since it produces a cleaner geometry according to the regular blender's boolean modifier. enter image description here

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Blender's Boolean operations are still lacking a lot. There isn't really anything that you can do about this. I do believe that there was some kind of add-on that fixed a lot of issues but I can't remember the name.

Maybe the Boolean operation within Edit Mode could give you better results. To do this (be in Edit Mode) press Spacebar and search Boolean. Choose the Boolean in Edit Mode option. Here is the official documentation: Link

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  • $\begingroup$ Nils, I get "modifiers cannot be applied in edit mode".... $\endgroup$ – user38409 May 2 '17 at 4:36
  • $\begingroup$ No, No. Sorry for no explaining properly. First of delete the modifier. Next select the two cube and press Ctrl+J. Then enter edit mode and select the smaller. Then press spacebar and search boolean and select it. If this does nothing try do this with th bigger one. $\endgroup$ – Nils Eisen May 2 '17 at 4:53

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