Experimental fan duct for Monkeyfab Prime3D

An add-on for [Monkeyfab Prime3D](http://3dwpraktyce.pl/prime3d/) printer designed to improve cooling of extruded material. Unfortunately, during my test it didn't show any remarkable effect on printed things. However, If you own the same printer - you can try it yourself. If you found it useful, please let me know :)

Compatible with Budaschnozzle hotend.

More information (Polish):
http://3dwpraktyce.pl/2014/12/nawiew-do-chlodzenia-wydrukow/