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I'm trying to make a shower drain and am using a Boolean modifier into a very flat cylinder. I was able to get the circles where I wanted them, but the geometry is weird. When I add a subdivision surface modifier, it gets all messed up. I've been trying to dissolve edges, and re-mesh but I just can't figure out what to do now. And frankly, I don't really understand the root of this problem. Any thoughts? enter image description here enter image description here

Thanks!

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The extrusions inside a flat surface should be inset, otherwise blender is trying to smoothen the sharp edge between the surface and the hole resulting in a weird geometry.

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