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The RepRap stepper driver (http://reprap.org/bin/view/Main/Stepper_Motor_Driver_2_3) runs fine with most steppers. But if you run it at its highest current (near to the maximum of 2A) the driver chip will get pretty hot.
The fan mount will allow you to attach an ordinary 12v CPU fan (34mm hole centres) to the stepper driver board to cool the driver chip. If you want you can use heatsink compound to stick a small SMT-type heatsink to the top of the chip to improve cooling even further.
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...
RepRap Stepper Motor Driver v2.3 Fan Mount by adrian-bowyer is licensed under the GNU - GPL license.
So what's this mean?
We're sure adrian-bowyer would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!