Hi Martin, it's a similar problem as that previous one but a fairly different case inside the filleter itself as the fillet in your case here is made up of multiple different segments and not all one single closed fillet surface.

Do you have this in its pre-filleted state?

Also it looks like this may have been done with the "constant distance" option in filleting? That particular filleting method seems to have some various more problems than some of the other methods, I've sometimes thought that maybe I should remove the option for it since it doesn't work all that well.

- Michael