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This is my first model for 3D printing, and I'm trying to fix non manifold edges. I included a screenshot, there are 6 non manifold edges. Things I already tried: - recalculate normals - remove doubles

To me it looks like there are no double edges left, so I'm clueless to what causes this problem. :) Who can help me?

The way I created this part is deleting two faces in the wall, extruding the floor face and merging the vertices to make it 1 piece again. enter image description here

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Non-manifold geometry is geometry where an edge is shared by more than 2 faces:

enter image description here

This is what you should be looking for. It's easy to find using Select -> Select All by Trait -> Non Manifold

enter image description here

Once you find it you can fix it by deleting some unnecessary faces, or separating the edges. You could use Edge split for that:

enter image description here

Note that it splits them all so you need to move one and then remerge the two you like connected(you can use Merge by Distance for that)

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  • $\begingroup$ So basically i need to remove the 'inside' of the extra cube on the wall, so I don't have edges with 3 faces, I'll try if that will solve it. $\endgroup$
    – Hadassah
    Nov 25, 2019 at 18:38
  • $\begingroup$ Yes, that solved it! Thanks! $\endgroup$
    – Hadassah
    Nov 25, 2019 at 18:40

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