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I am unable to add an edge loop around the outer edge of this model (around the rim), and it is driving me crazy trying to work out why.

  • All faces in the model are quads (verified with Select Faces By Sides);
  • I have removed all doubles;
  • The relevant faces seem to be connected (verified by dragging them about).

Despite the above, you can see that any edge loop will only go through 6 faces and stop.

I made the object using mirror and array modifiers. I expect this is reason, but I cannot explain the persistent effect now that the modifiers have been applied.

I'm sure this is embarrassingly obvious, but I am clueless.

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You can't perform edge loops because your model has non manifold entities (vertexes and edges). You can select non manifold edges, delect them, then fill the faces correctly. Tnon-manifoldo select non-manifold edges proceed as following image, then delete them, then fill with faces. (redo this step until you got no non-manifold edges).

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  • $\begingroup$ Bingo. I had internal faces that I had managed to miss. Stupid error. Thank you very much. $\endgroup$ – Lewis Nov 4 '16 at 14:22
  • $\begingroup$ no problem. Be aware of those "artifacts", specially if you go for 3D printing or work with CNC. External software doesn't handle with this, and will produce everything but expected. $\endgroup$ – MCunha Nov 4 '16 at 14:25
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I don't know why it happens but I know how to resolve: Every part of the mesh where there are 2 faces loops between two spokes, delete the 4 vertices inbetween (they also are not selectable as edge loop), then recreate them, extruding or bridging edge loops and then loop cutting and grabbing in the right position.

Edit: deleting and recreating just one vertex is enough.

enter image description here

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