Hello All, I have a prusa style 3D printer. You can think it as a custom made.It works with Arduino mega 2560 and Ramps 1.4. Everything was fine but suddenly extruder motor stopped working.I tried several things. I take out the extruder cable on Ramps board and replace it with X axes motor plug. Than i tried to move X axis to check if the motor is faulty or not. Extruder motor worked fine on X axis plug. I replaced motor drivers each other all of the motor drivers are working. I even replaced Ramps 1.4 with new one. Still same problem only Extruder is not functional.I am suspecting Arduino 2560 now. Does anybody faced with this problem before?Thanks in advance.Best Regards.