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I have a problem with the subsurface modifier. I am new to blender.

The modifier does this: Front side

I know the reason. It's because I have some geometry on the back: Back side

So on the back I have a corner. This is the top view:

Top view

I know I have a problem with the corner from the top too but that is a different problem that I need to fix.

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    $\begingroup$ Avoid N-gons (polygons with more than 4 faces). But,most importantly, avoid non planar geometry: blender.stackexchange.com/questions/56755/… $\endgroup$ – user1853 Feb 23 '19 at 0:02
  • $\begingroup$ @cegaton Thanks for the info. It fixed my problem. $\endgroup$ – Paul Moldovan Feb 23 '19 at 3:54

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