RepRapGuru Cooler Kit

--- Note ---
I learned the hard way, when printing ABS, turn the fan off altogether. It was causing part curl at the end of the print.

--- Update ---

I installed a 10uf capacitor across the (+) (-) terminals and it quieted the motor down substantially. For the heck of it I tried a 100uf cap, and I lost the ability to adjust the speed of the fan, it's like Ramps wanted to push the fan 100% on with no speed control. So somewhere between 10uf and less than 100uf and you should be good. P