I have two identical objects (at least I cannot find a difference), but one can be beveled, the other not. Any idea why? I already looked for double vertices.


The blender file (version 2.8) can be downloaded here:



You have an hidden internal face.

Doing Search (F3) > "Select Non Manifold" reveals the problem:

enter image description here

In this case, all you need to do is to remove the face: X > "Faces".

enter image description here

Note: if you use the Bevel modifier with "Clamp Overlap", it probably works, without the need to fix the topology. But this is a bad practice as you can then easily forget that your topology needs to be fixed, and the problem can resurface later (boolean, sculpting, 3D printing, UV unwrapping)

  • $\begingroup$ Thanks Nicola! This is something I would have searched forever, as I had not yet heard about this function. $\endgroup$
    – Chris S.
    Nov 26 '18 at 13:58
  • $\begingroup$ looks like this function is not available in blender 2.91, this search does not come up in edit mode. $\endgroup$
    – Asghar Ali
    Dec 19 '20 at 19:31

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