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I made mesh for deck of guitar. After, I had to make a hole in this mesh. Also I used Subdivision Surface Modifier. I created a circle to use "Knife Project". Made in the mesh a circle then deleted face to make a hole. As u can see, there are some triangles around this hole. If K remove "Subdivision surface", these triangles disappear.

enter image description here

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  • $\begingroup$ your topology must be bad, please show the wireframe $\endgroup$
    – moonboots
    Jul 16, 2019 at 19:47
  • $\begingroup$ sorry your file makes my Blender crash, so someone else will help you ;) $\endgroup$
    – moonboots
    Jul 16, 2019 at 19:59
  • $\begingroup$ @moonboots should be 2.8... I was involved in another part blender.stackexchange.com/questions/145528/…. This one is yours ; ) $\endgroup$
    – lemon
    Jul 16, 2019 at 20:10
  • $\begingroup$ And, @Kaznachei yes, a guitar for a beginner is hard (it is hard for anyone, in fact). $\endgroup$
    – lemon
    Jul 16, 2019 at 20:12
  • $\begingroup$ it crashes with my 2.8 ;) $\endgroup$
    – moonboots
    Jul 16, 2019 at 20:20

1 Answer 1

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Ok, the problem you mentioned in the comments is because of these little straggler vertices that aren't connected to the mesh like the others.

stragglers

So to fix that you can start by deleting this ring of faces:

delete

Next, you create a new circle, place it where you want the hole, select the circle and the rim of the guitar created by the deleting of faces, hit ctrl-E, and select "bridge Edge loops".

And here is the result:

bridge

It's definitely not as pretty, but there doesn't seem to be any intersections or anything, and it does get the problem fixed. Hope that helps.

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  • $\begingroup$ Thank u. It really helps me)) Learned the secret of universe)) $\endgroup$
    – Kaznachei
    Jul 17, 2019 at 8:07

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