Prusa MK2 Nozzle fan mount
Not sure about anyone else but my fan came with nothing to attach that tiny little fan to the heat sink of my nozzle. I looked around and found none so I made one inspired by these ideas and a bit of re modelling on Tinkercad.
http://www.thingiverse.com/thing:340312
http://www.thingiverse.com/thing:21112
the holes are not perfectly lined up to the fan holes so I suggest putting in the two diagonal screws first then drilling out the other two a bit.
The fan fits super snug but is easy to remove if need be.