Thanks Michael, that makes things clear. Indeed, I was able to leave out the tiny arcs and replace them by a 2 point bevel, it looked the same in the render.

Wim

Hi Wim, and also in the just released v3 beta I have tuned up sweep so the mitering automatically shrinks down the tolerance for little small sized areas during the intersection calculations, so this file that you originally posted here will now sweep ok in the current v3 beta even with the small pieces left in place.

- Michael