The NEMA 17 stepper motors are running too hot from the BlackBox Controller. I have adjusted the axis current 'pots' fully counter clockwise against the stop. I tried the clockwise direction, but that only increases the heatup and cogging. There is more than adequate torque at this minimum setting, but the motors seem to be getting too much current, and I do not think they will last very long. The controller is used on a laser etcher using the X-axis, Y-axis, Y2-axis, and PWM/M3 signal. The system has accurate positioning and laser control, but has not been used very long in fear of damaging the stepper motors.