Inline Extractor Fan for K40 (or other use)

I hated that ugly and much too big extractor contraption that gets delivered with the Chinese K40 laser. It won't let you open the lid to the laser tube compartment because of it's size so I decided to get rid of it and print my own inline extractor fan instead. The only thing I reused from the original is the motor and the fan, the rest went in the bin.

It used 300m of filament when I first designed because of the vast amount of support some parts needed so I redesigned it and now uses abou