tronxy X1 fan support 40x40 and air duct

I created a new X1 fan holder for filament cooling.
I added an upper air duct shape : it reduces the fan noise drastically !

The 2 shapes are printable without support

surfaces are quite thin on purpose, in order to keep the moving parts light

I added the .SAT file if you want to improve the object

updtae 03:2018:
I replaced the fan by noctua Fan
I came back to the other duct shape ( with the high temperature the PLA tend to go down with time )
My other fan holder is https://www.