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I'm trying to perform a booleon difference but I'm left with some odd geometry that I cannot seem to get to work correctly.

I've tried all the things I know about trying. On the objects I'm using as the cut out I have done a Clean Up -> Merge By Distance, and a Recalculation to ensure all the normals are facing in the right:

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But I'm still left with this odd Geometry as an artifact of the booleon and I don't know what to do to fix it.

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If I apply the booleon I end up with a really unexpected set of geometry that looks like this:

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What do I need to do to eliminate this artifact in the resulting cut out? I'm using 2.81.

blend file

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    $\begingroup$ could you please share your file? $\endgroup$
    – moonboots
    Nov 30, 2019 at 11:33
  • $\begingroup$ Have added a link to the file. Thanks. $\endgroup$
    – Jammer
    Nov 30, 2019 at 11:53
  • $\begingroup$ what are you trying to do exactly? If you're trying to make a slot, your boolean object is not good because its bottom is hollow. If your problem is the artefact we see on the surface, it's because of the stretched triangles that are created by the boolean $\endgroup$
    – moonboots
    Nov 30, 2019 at 13:20
  • $\begingroup$ I've managed to get it to work ok now. I used the auto smooth and the 3D Printing add-on to ensure everything was manifold. $\endgroup$
    – Jammer
    Nov 30, 2019 at 14:02

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One thing that really improves Booleans is the 3D printing tool add one. Enable that (it is not enabled by default in 2.81) and then view it from the side menu at the top right. You can e it to check that everything is manifold and all your normals are correct and so one before you do a Boolean

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  • $\begingroup$ Thanks for this tip. I ran a check on the cut out objects and then did the Make Manifold operation which reported fixing some things. Unfortunately, enabling the bool modifier I still end up with the same artifacts. $\endgroup$
    – Jammer
    Nov 30, 2019 at 11:10

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