Horn fan duct for 50mm fan

Edit: 21.04

Updated the fan duct and the fan case.
Fan case now fits microwsiss and stock hotends nicely and has several smaller improvements and adjustments.

The fan duct just got a smaller adjustment.


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Alright, after several attempts i got this hearing aid where i want it. I think.
Having options is good. If you think some other fan duct works better... knock yourself out.

This is my attempt to create a single fan duct for a regular 50mm fans, because there arent many