Hi Pilou,

> Seems there is a little error ;)

Yeah it looks like a bug in the filleter when trying to handle sharp corners touching a smooth surface right at the seam area of the smooth surface.

Unfortunately that's not an easy area of code to work on fixing up, it will probably be a while before that bug can get fixed.

In the meantime since that object is symmetrical it looks like there are other fillet areas that were created correctly that can be rotated and trimmed into place to fix that one little spot if you want to correct the error.

It's awfully hard to see that little spot in the rendered model though.

- Michael