FLSUN kossel fan mount (beta)

Inspired by: http://www.thingiverse.com/thing:780379

Fitted to FLSUN Kossel.

Features:
-modified holder
-optimized fan duct
-for 40x40x10 [mm] fans

Notes:
-Extruder_Mount.stl isn't watertight but printed result was good
-DON'T use pc cooling fans (weak & expensive)