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Just starting out, created a planar mesh, in edit mode, hit E to extrude, and I get this: extrude

broken extrude

Extrude doesn't create any perpendicular faces or vertices, it just duplicates the flat mesh and grabs it. What's going on here?

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I think you might have hit Extrude once, and not moved the mouse and now there are duplicates of every vertex. You can remove doubles and Extrude again, should work fine.

This is what you're seeing: enter image description here

Select everything, press W -> Remove doubles. Then try to extrude again:

This is what you want to see enter image description here

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  • $\begingroup$ There were no duplicate vertices, but I realized what was happening when I viewed face normals- somehow I had a duplicate face on the other side (the entire n-gon). $\endgroup$ – jtiscione Mar 9 '15 at 20:38
  • $\begingroup$ As you've only started out using Blender it may be difficult to track down the exact steps that introduced this confusing result (hitting F joins selected faces, i suspect that was involved too). $\endgroup$ – zeffii Mar 10 '15 at 8:01

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