What is the best bet on the cause of this?
Dual motor y axis and all motors have their own external diver
DLC32 max is the board, the work 1950x790.
It doesn’t seem like the step lost increases over distance just any time the y axis travels toward home.
Looks like something loose. I would check set screws in drive pulleys, loose belt etc.
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So, I went though and tightened everything.
Is there any situation where software or stepper drivers could cause something looking like this?