I got the kit set up, all motors working, everything looks good.
BUT, when I start printing any gcode, after every (let's say around) half a layer, the extruder moves a few millimeters on the Y axis, so it prints like a ladder, which doesn't work of course.
No idea why this would happen, any clues?
Have you adjusted the motor currents on the drivers? The Y stepper might be losing steps.