Interesting, printing works fine for me. The pins that need to change are here: pins_RAMPS_13.h Code: #if ENABLED(REPRAP_DISCOUNT_SMART_CONTROLLER) #define BEEPER_PIN 37 #define BTN_EN1 33 //--ROBO-BH Swapped #define BTN_EN2 31 //--ROBO-BH Swapped #define BTN_ENC 35 Just reverse the BTN_EN1 and BTN_EN2 that will put it back to default. Located at lines 143 and 144. I need more info than just saying "printing went away." It would be much more helpful to state exactly what you did and what you tried as well as the results. Printing works, is about all I can say when I have no other information to go on.