RepRap Stepper Motor Driver v2.3 Fan Mount
thingiverse
To enhance cooling of the RepRap stepper driver (available at http://reprap.org/bin/view/Main/Stepper_Motor_Driver_2_3), print a fan mount upside down on your 3D printer. Attach the wiring to the PCB initially, followed by connecting the fan to the mount and then to the board. Solder the fan leads in parallel with the 12V supply, ensuring correct polarity (red = +; black = -). The design allows for adjusting the stepper-current-controlling potentiometer using a screwdriver between the fan's blades, but ensure it's turned off first.
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