I haven't been able to get 3D contour to output arcs on this cut, you can see the 3 straight segments it created in the toolpath view Creating the 2d wireframe was a lot of work, seems like there's gotta be a better way... but I have to program extra length because the larger slot this "rat tail" intersects is diecast into the raw material and will vary The tool is a .031" x 20 degree runner cutter from Harvey, so the path I need is centerline w/ no comp The helical geometry