John, I've never seen anything like that when exporting a DXF. Are you sure it's actually in the DXF file and not his software?
The reason I ask is that I have seen that type of scenario when working with small radii on some older Centurion based CNC's as well as our own WaterJET machine that uses an obscure Italian (Intaglio, sp?) software. It doesn't show up on screen on the machines but when you try to cut a part it will add loops to anywhere it didn't think the tool would have fit.
You make a good point. I am going to see if he's still got the original file, and compare a few versions.
The image on far right is from his DXF "viewer/software" rest are from the WJ HMI, so yes it is indeed possible it was at his end.
I originally thought i had created some sort of robotic singularity for the WJ with a sloppy sketch, but my end (I think) is clean. Unfortunately I overwrote the dxf