I had a problem with my B machine being about 1/8" off in the X direction. Among other things, I was doing a carved area bordered with a vector carve (1/8" cutting bit) with about 1/8" un-carved between the two. The uncarved are almost disappeared on one end and got wider on the other. I replaced the tire (O ring) no the brass roller. To test it I created this simple MPC. I designed it with 1.187 so I could share it. BTW, my test was with about 1/64 - hard to measure accurately with pine.
Clint
Tracking Test
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