Michael, I attached the file which gives me problems with tapered extrude as "extrude tapered problem".





<<Yes absolutly : Till now Moi's Fillet don't manage that (i tested with Onshape, DesignSparkMechanical, Fusion 360...it's the same)

Do you mean that the fillet systems of those programs also can't do a higher fillet or that they can? I understand that some shapes can give MoI's fillet a hard time, like the example I started this thread with but what about this?






I think the construction line is preventing the fillet from being larger. What I want to know is: can other programs solve this fillet or is this a universal NURBS fillet problem?

I understand that there is a natural limit to fillets because the trim curves intersect each other:





But is there a way to solve a fillet when there is a construction curve in the way? I also uploaded the file for the fillet issue.