Prusa Centrifan

In spite of finding plenty of designs for fans, none seemed to work for me. Some would cool the hot end so much it got it to a temperature so low it would stop extruding, whereas others wouldn't cool it enough. This led me to design my own centrifugal fan based off of a small DC motor commonly found in cheap toys.
If you are picking a motor especially for this, make sure it's got high rpm (torque is of little importance here). Furthermore most of these motors will not be 12V tolerant and so w