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I always mess up my model in blender. At some point I manually add vertices on edges with subdivide and then I connect them with J, and sometimes I have to fill faces with F.

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As you can see my model is a little bit messed up and this happens all the time. And I can't properly use the loop cut tool anymore.

Any idea how to fix this?

Update:

Here is the blend.file

http://www.pasteall.org/blend/25381

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This is happening because of two things.

  1. Because you are using N-gons. N-gons perfectly fine when making hard surface models but when it comes on to topology, they get a bit difficult to work with.

    enter image description here

  2. You have faces on the inside of your model. This is a no no and the Edge Ring tool will detect these when you are trying to make a ring and won't allow it.

    enter image description here

So to fix, you can use the Knife tool to try and cut the ngons into quads (See this post on how to use the Knife tool), don't just select vertices and press F. Next, remove all inner faces of your model, you can just go into Wireframe view and select the faces and use X > Faces.

Trying to create an edge ring with inside face(s).

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Creating an edge ring without inside faces.

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Trying to add edge rings to an Ngon vs trying to add edge rings to quads.

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    $\begingroup$ There is a tool for selecting inner faces, in Header > Select > Inner Faces $\endgroup$ – gandalf3♦ Nov 23 '13 at 21:08
  • $\begingroup$ This answer was helpful to me in working on a much simpler model. I was trying to loop cut a cube but when I turned on the tool it would do nothing. The reason? I had beveled off the cube corners (with simple slices, so the corners were triangles), so it was not really a cube anymore, and every surface was a polygon. There were no quads for the tool to work on. I guess the rule is loop cut before beveling. $\endgroup$ – David Rhoden Sep 30 '16 at 22:23

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