Hi All, I can never seem to find any information regarding stepper motors and there use as to there ratings. I expect to be using a controller which has stepper drivers rated at 2 Amps and are software controlled (no trimpots). I have steppers as follows: Nema 17 1.8 deg 4.5V 1A 6 wire 350mNm (50 oz.in) to be used on the x and Y axis. I have NEMA 23 motors rated 1.8 degree 3.7 VDC, 4.2 Amps per phase, to be used on the Z axis (2 motors). My question has always been What determines the min or max ratings for the motors to be sued. Is it the controller rated amp per driver or the ratings per motor and power supply, etc, etc. I can't find anything specific on use of motors and if these will even work for my 3d printer build. Any help would be appreciated.