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I made a circle and then made a boolean cut into it with another circle. But when I apply the sub. surface, the outer circle is fine but the inner section changes into a weird quadrilateral. I want the cut to be in a shape of a circle. How do I solve this?

A really weird circle cut

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  1. Remove the sub surface modifier
  2. Delete the center edge on both sides
  3. Select the big and small edge and press F to fill the edge. With the f2 addon just press F until it fill all the edge. Repeat on both sides
  4. Then add the sub surface modifier
  5. If you need smooth inner side add crease.

enter image description here

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