Ai3M stepper driver fanduct

I designed this fanduct for the Stepper drivers with focus on aerodynamics AND printability. You can choose ether a 40mm or a 50mm fan to replace the original fan (which is one of the loudest and also most ineffective fans in the Ai3M).
The model is split in two. It is a good friction fit, but I recommend to use a drop of superglue to connect the two parts.
And do yourself a favor and replace the ridiculously loud original fan with another one with less power and good aerodynamics. From my point of view, Noct(..) fans are highly overpriced, there are many other fans out there that are even more quiet and cost less than half of the Noct(..) fans.

Have fun printing and enjoy the quietness of the Ai3M! :-)