The Z axis on my reprap Prusa mendel i2 makes a buzzing sound when I try to move it. I have adjusted the pots on the controller all the way from one end to the other and it does not move at one end then starts buzzing back and forth in both directions once i reach a certain point. I switched the motors on the Z axis out to the X and Y axis and both motors worked fine. I have Arduino Mega 2560 with RAMPS v1.4. Should I swap the motor controllers out on the RAMPS card to test that controller or is there something else I need to try? I have 12v going in to both power inputs on the RAMPS card. Do I need to try to hook up a separate power supply of 12v on one of the power input connections just in case too little electricity is coming in from the power source? Are there any adjustments that need to be tried in the firmware on the Arduino?
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