Just finished my prusa mendel I3.(I thought). However I loaded sprinter firmware and in pronterface when I try to move the motors they just hum and vibrate and get very hot. I don't want to touch the tuneing on the pololu becuase the motor are hot, so they should be getting enough current. I am useing 6 wire unipolar motors. I have all 5 motors wired as following
A- - A1pin
A+ - A2pin
B- - B1pin
B+ - B2pin
A- - A1pin
A+ - A2pin
B- - B1pin
B+ - B2pin