Dual 40mm fan duct

This design was originally done by Marteinnsig. I wanted to add a second parts cooling fan to it. Using Tinkercad to add a secondary fan duct. Fits with the Micro Swiss hot end on my CR-20.

Update: I've noticed with the Micro Swiss hot end that the leftmost fan duct is rather close to the stepper housing causing clearance issues. printable spacers required until I redesign the fan duct.

-V1.2 Dual fan duct with added space to clear the stepper.
-Added a spacer for V1 Dual fan duct to sa