I'm trying to subtract "cuttingobject" from "solid".



It says "Calculating..." for a few seconds and then just seems to abort the calculation?

Hi Andre, which version of MoI are you using? it seems to be working ok for me over here using the current v4 beta. V3 is behaving like you describe.

I think the problem is in this area here though, it's subtle but notice how that edge is slightly darker than the others? That's because there is more than one edge there because there is a very skinny surface fragment there. V4 seems to be doing a better job than V3 at handling that:





- Michael

I have just tried out v4 beta and I can confirm this works now.

Indeed there is a super tiny surface there at the bottom of that fillet. Maybe it has to do with the way I made that fillet: I made a hard step first, like this:



Then I filleted the top edge and for the fillet radius I chose the height of that step by clicking to top corner and the bottom corner. Maybe that wasn't exact because of the curvature of the surface below. Or maybe I let it snap at the wrong point. :D