Generic Parametric Cooling Fan Nozzle

This is a nozzle/duct for cooling a 3D print. It's not the most effective, but it will work for any printer where the print bed moves up and down for Z. Designed to fit a 40mm fan.

v2:

* Optimized for Customizer, since the design can be easily adapted for other fan sizes by changing some variables.
* Increased nozzle wall thickness - 0.6mm was too thin for my liking

v1:

* Basic design. The curve is sinusoidal for smooth turns in airflow.
* I'd like to make the output end wider, but