CR-10 5015 fan mount

Simple and efficient cooling duct. Goes along with this hotend fan mount:
https://www.thingiverse.com/thing:2612897

Easy and fast printing compared to a FANG, no waste of plastic
Only one 5015 fan (those are quite noisy, hence the remix)
Screwed tightly to the X carriage
Easy disassembly and access to the hotend
Mount for a 8mm dial gauge to help with bed leveling
Easily customisable