@Therealfury You're welcome! I also prefer this quick and dirty solution, way faster and durable than a firmware change. Before inverting the cables, check with a multimeter which cables are connected to the same set of bobines, and be sure to reverse only one pair, as explained here: https://electronics.stackexchange.com/questions/70643/how-to-reverse-rotation-direction-of-stepper-motor I suspect, but I might be wrong, that the cables 1 and 4 you tried to swap belong to different bobines, and that could lead to have an identical voltage applied to the opposite sides of each bobine, thus the current not flowing.