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Here is video of the problem: https://www.youtube.com/watch?v=9rAeFdRckN0

What might be wrong with those edge to bevel in such way?

Edit1 : Here is dropbox link to file. https://www.dropbox.com/s/d7lc0zirimptwcm/wheel.blend?dl=0

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    $\begingroup$ Can you upload the file? $\endgroup$
    – Omar Emara
    Jul 11, 2016 at 15:34
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    $\begingroup$ @OmarAhmad When suggesting that someone should upload a file it is better to suggest where they should upload it. blend-exchange.giantcowfilms.com is the preferred location. $\endgroup$ Jul 11, 2016 at 16:23
  • $\begingroup$ I've just gotta say, we've been getting a lot of low-quality questions from new users lately... but this one is really good. It's a generic question, simply and clearly asked, with sufficient supporting information, and without editorializing. Good job, @EvgeniPetrov $\endgroup$
    – Matt
    Jul 11, 2016 at 19:05

1 Answer 1

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Beveling ngons (faces with more than 4 vertices) is not a good idea : results are not really predictable.

Here is a view of the inner geometry with triangles (on the right) :

enter image description here

The upper part of your mesh is good, but the ngon part does not allow to manipulate it well (for beveling, for instance).

So for a good bevel, you should redo this part with quads only (faces composed of 4 vertices), the same way you modeled the upper part.

Also take care of the bottom part (on the left) which is composed of 5 vertices.

To 'repair' the mesh

  • Go to edit mode
  • First of all, select all and remove double vertices (some are doubled)
  • Set face selection mode by Ctrl + Tab then face
  • Select the two faces which are ngons then delete this faces (X then 'only faces')

enter image description here

  • Set vertices selection mode by Ctrl + tab then 'vertex'
  • Select the vertices like below in order to count them (here 18)

enter image description here

  • Give 18 cut on the bottom part (Ctrl+R then Page Up 17 times)

enter image description here

  • Select the top and bottom vertices on one side (without the extremities)
  • Then Ctrl+E and 'bridge edge loops'

enter image description here

  • Do the same for the other side

Now we have this below, so simply complete the faces for the extremities.

enter image description here

  • Beveling :

enter image description here

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  • $\begingroup$ ....and this is a good, clear, simple answer, too. Good job. $\endgroup$
    – Matt
    Jul 11, 2016 at 19:05
  • $\begingroup$ Is there easy way to seperate face to more faces? $\endgroup$ Jul 12, 2016 at 13:08
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    $\begingroup$ @EvgeniPetrov, edited $\endgroup$
    – lemon
    Jul 12, 2016 at 14:20
  • $\begingroup$ Wow! Thank you for the great answer! "Bridge Edge Loops" is what I really was looking forward, did it manually :/ $\endgroup$ Jul 12, 2016 at 14:43
  • $\begingroup$ @EvgeniPetrov, doing it manually can be fast too if you use the 'F2' addon (mesh_f2.py) $\endgroup$
    – lemon
    Jul 12, 2016 at 14:51

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