You have a 12V motor. Not good, especially if you are using a 12V supply. You want to get lower inductance motors- look for motors rated for about 2A at 1-3V. The motor drivers control the average current in the motors- rated voltage doesn't bear any relationship to power supply voltage except that it is normal to operate steppers at 5-20X their rated voltage in order to keep torque up at high rotation speeds.
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