Hi Sonny, I have built a machine with a single open loop belt configuration (similar to the AxiDraw by Evil Mad Scientist Laboratories). The mechanics of it works well but the consequence of it is that motion with one stepper motor only results in diagonal motion instead of motion along one axis only. So in order to get pure x and pure y motion, a superposition of the two motors needs to happen. Where in the Grbl Library can I find the code to change in order to send both x and y step commands to both motors simultaneously and to make the direction command send to both as well depending on the combination of directions eg: (1,0) ; (1,1) ; (0,0) ; (0,1). Would appreciate your input on this checkmate matter. Thanks!