Why Do I Have Black Lines on My Mesh After Set Smooth?
Submitted by darek on Wed, 03/12/2008 - 19:52.
A commonly run into problem when first starting out in Blender is the seemingly spontaneous appearance of black lines after editing an object. Thankfully, there is a quick and painless fix to these problems that’s never failed me.
- Enter edit mode and select all(A)
- Press Ctrl-N

There you go! If that didn’t fix your problem, ask in the comments.
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