I'm trying to cut away a curved part inside a custom mesh with the help of a cylinder but the boolean modifier doesn't seems to work, When I try it with another inbuilt meshes it works I have applied the boolean modifier on the custom mesh and then selected the cylinder for booleanScreenshot

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    $\begingroup$ I think Andrew's anvil and donuts give us the most of our work here... (just a little comment as it is in comments... ; ) $\endgroup$
    – lemon
    Sep 7, 2019 at 18:16
  • $\begingroup$ Concretely, you should add some picture of your modifier settings or upload your file using blend-exchange.giantcowfilms.com $\endgroup$
    – lemon
    Sep 7, 2019 at 18:25
  • $\begingroup$ I'ts a default boolean modifier with difference and cylinder selected as object $\endgroup$ Sep 7, 2019 at 19:20
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    $\begingroup$ Sometimes, boolean fails. Is the cylinder close shape? Have you tried to change its threshold a bit? Again if you could upload the file that could be fast to know. $\endgroup$
    – lemon
    Sep 8, 2019 at 5:25
  • $\begingroup$ please share your file: blend-exchange.giantcowfilms.com $\endgroup$
    – moonboots
    Sep 8, 2019 at 8:19

1 Answer 1


(Assuming Blender 2.80) The anvil has a defect geometry. To fix this, select the anvil, go edit mode. Then "Merge Vertice->By Distance" and leave Edit mode. Then it looks like this: Andrews Curse ;)

PS: I switched the cylinder into "Wire" display...


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