I'm getting layer shifting on the y axis. Sometimes it will do ~100 layers just fine, other times every 3rd layer or so seems to miss steps and get offset from the ones underneath it. I've checked the pulley lead screws are tight and the belt is properly tensioned. Do I need to adjust the stepper driver? How much and which way? The motor for the carriage seems underpowered.
Trimpot adjustment to send more power to the Y-Axis (Hotend Axis) should solve the issue if you think it's under powered. Whilst powered off you can remove the stepper and turn the trimpot clockwise slightly to increase the current being sent tot that motor.
Also check that the carriage wheels are not clamped onto the beam too tightly.
I've done both these things, I'm still having the same problem though. Any other ideas?
I think the motor driver was messed up and may have led to damage to the stepper motor. I've ordered replacements and will update when possible