I want to bevel outer edges of that hole. But it results in distorted object. I have tried improving topology but it does not work.
Here is blend file
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$\begingroup$ Hello :). I can see multiple possible reasons from your images. Please upload your .blend here blend-exchange.giantcowfilms.com so I can take a look. $\endgroup$ – Jachym Michal Nov 26 '19 at 8:24
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$\begingroup$ @JachymMichal Done! : ) $\endgroup$ – user541396 Nov 26 '19 at 13:37
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2$\begingroup$ Hello. It was caused by flipped normals. Select all vertices and go to Mesh->Normals->Recalculate Outside. Then it will work just fine. CGMatter ecplains more here youtu.be/Z--dnYonag0 $\endgroup$ – Jachym Michal Nov 26 '19 at 14:02
