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Newb here. I'm going through Blender Guru's intermediate tutorial and have roughed out an anvil. I've created a cylinder to subtract form the side of the anvil using a Boolean difference modifier. The modifier is having no effect, though switching it to union or intersect causes it to do what it's supposed to. I've confirmed that all normals are pointing out. I'd attach the file but I don't see any way to do that (screenshot of what I'm looking at below). Hopefully my description is enough for someone to point me in the right direction. Thanks. enter image description here

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You have overlapping vertices that prevent the boolean, select your anvil, go in Edit mode, press Alt > M > Merge By Distance, and it will work.

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  • $\begingroup$ Yup, that did it (though Alt-M brought up the Split menu; I had to do it form the Mesh menu). Thanks. How could you tell there were overlapping vertices? $\endgroup$ – Involute Oct 11 '20 at 3:02
  • $\begingroup$ I hid some faces and discovered some floating edge, but anyway, it's always something you can try when a boolean fail $\endgroup$ – moonboots Oct 11 '20 at 5:06

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