Blender 3D Printing by Example

Correcting non-manifold edges

Your approach to fixing non-manifold edges will vary depending on the circumstances. As a general rule of thumb, my strategies are:

1. Are there other contributing issues? As we have seen, other problems in the model can lead to non-manifold edges. As the first plan of attack, remove doubles and check face normals.
2. Do you have missing faces? It is possible your non-manifold edges could be resolved by hitting F to create a missing face.
3. Are these extra edges or geometry? Sometimes deleting the offending non-manifold edges puts your model back intact.

If the model is still troublesome, you do have the option to delete and recreate offending edges and faces. That could be a tedious venture. Luckily, the 3D Printing ...