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Dust
Since its a core xy...
X moves when both motors turn the same direction
Y moves when both motors turn in opposite direction
if you want to invert Y movement, you have to swap X and Y stepper motors to each others plugs on the controller (Never do this while it has power!)
Tried this but the x and y axis got swapped around. The y and x were both moving in the positive direction though, but in the wrong axis.