I have a Prusa I3 X The extruder motor does not move, even without filament. I confirmed that the motor is working by plugging in the Extruder motor to the Y axis port and sending it commands through Repetier and through the LCD move controls. I also confirmed that the motor driver works by swapping the y axis driver and the extruder driver and sending commands in the same fashion. It appears that the port where the extruder plugs into is not sending the commands to move the stepper motor, not matter what driver or motor is plugged into it.

Any help will be apprecited.

I didn't find the right solution from the Internet.

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Thank you.