Summary Update 10/28: I also had trouble getting the tip to slide smoothly over the surface, so I rounded out the end. Less accurate but more clear during demonstration. This is Tipv3 I printed the AFM model at 175% it's normal size Cura for Ultimaker and Lulzbot both had trouble processing the original tip file, either placing a gap between tip and shaft or only importing part. So I just heightened the shaft slightly to insure overlap and re-exported as an STL. Sliced fine and printed great