Hi Niko - so yeah it looks like MoI's filleter did not quite get a clean trim at the ends of the fillets in that spot there.

That's one of the issues that makes filleting difficult - trying to get a clean intersection where 2 fillet pieces cross over each other where they are tangent or very close to being tangent.

Things that come to the same tangent kind of have more of a zone where they are overlapping in a certain sense which is much harder to calculate than a crisp intersection where things collide at a 90 degree angle or something like that.


So at any rate, the actual problem here was not really in the booleans but more in the filleter.

- Michael