Hi all. i have a prusa i3 with a MKS board ( integrated arduino and ramps) . I disassembled the bowden extruder to change a plastic part and when i tried to make it work again it didn`t move. First i thought it was one of the a4988 drivers but when i changed it, nothing happened either. I tried changing the nema to another port and it worked, so i think it is the socket or something of the sort.by vagonico - Prusa i3 and variants