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Im using a boolean modifier and the face are correct yet the difference operation not working on it. Im making 2017 and i want to cut the 0 with the shape as u can notice in the image and blend file attach. Plz let me know whats wrong with my modelenter image description here

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    $\begingroup$ I have changed the Solver to Carve (in the Boolean modifier settings ) and now it works. But I don't know why it doesn't work with BMesh, sorry. I think this type of model could be easier to make by drawing its shape from the top view (using curves for example) and extruding it. $\endgroup$ – Jan Kadeřábek Dec 9 '16 at 15:07
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    $\begingroup$ You should clean up your 2017 mesh first. There's ~294 doubled vertices. If you delete the '0' upper and lower faces, recreate as ngons, then boolean 'cut', it cleanly punches out the middle. $\endgroup$ – Leorex Dec 9 '16 at 15:17
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    $\begingroup$ "Fix my blend" questions are frowned upon here because they are of little use to future readers. Instead, well-developed, general questions apply to many situations and are far more useful. $\endgroup$ – JakeD Dec 9 '16 at 15:35
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    $\begingroup$ While I didn't downvote, one more possible reason is that this question was asked a lot times before. With the culprit - do not use Ngons and double vertices with Boolean. Those are generally bad things, but they are even worse when combined together with Boolean. $\endgroup$ – Mr Zak Dec 9 '16 at 15:41
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    $\begingroup$ The reason for why it's not working is already stated above by @Leorex and me - doubles and Ngons (faces with > 4 verts). Remove them, then recreate new ones / fill with quads. Then BMesh will work as well as Carve. $\endgroup$ – Mr Zak Dec 9 '16 at 15:57
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The blend file provided has already had some Boolean operations applied. Both the 2017 and cut meshes have some doubled vertices and the 0 has overlapping faces.

You should always ensure clean meshes before you attempt Boolean operations.

Unclean mesh - doubled vertices

By deleting 0's upper and lower faces, removing both meshes' doubled vertices ( Mesh > Vertices > Remove Doubles ), then recreating the upper and lower faces, the Boolean operation is applied cleanly. The convex ngon works fine in this particular case.

Don't forget to hide the target Boolean object to see the results.

clean mesh, clean Boolean operation

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