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RepRap Stepper Motor Driver v2.3 Fan Mount by adrian-bowyer is licensed under the Creative Commons - GNU GPL license.
© 2009 by adrian-bowyer
Instructions
Print the fan mount upside down in your 3D printer.
Attach all the wiring to the stepper driver PCB first.
Attach the fan to the mount, then attach that assembly to the PCB.
Solder the fan leads in parallel with the 12v supply to the board, taking care to get the polarity right (usually red = +; black = -).
The mount has been designed so that you can adjust the stepper-current-controlling potentiometer with a small screwdriver between the fan's blades. Turn it off first...
