Hi Michael.,

Wow, I had a hunch there was an easier way to make the channel cutter, but I didn't think it would be so simple.
I see what you mean about my approach being defensive...coming from a Rhino 3 perspective, booleans aren't
always my friend, so I'm in the habit of making sure that objects extend past the edge of where they have to cut..
that's why it didn't even occur to me to use the semi circles as boolean cutters

This is a great example of how MoI redefines NURBS modeling.

Thanks,

Jesse