80mm Fan Holder for Prusa i3

Fits:
- Prusa i3
- Prusa i3 Hephestos
- Frames with two M3 screw holes separated by ~42mm

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Remixed from [138490](http://www.thingiverse.com/thing:138490):
- Better airflow
- Cable routing
- Less material printed

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Hardware needed:
- 80mm DC fan (standard computer fan)
- 2x M4 screws
- 2x M3 screws
- 2x M4 nuts
- 2x M3 nuts