fan duct
thingiverse
I've managed to crack open the original fan and instead of shelling out cash, I built my own using a 40 mm part that was lying around the house. This DIY design is compatible with the "part_cooling" component found on this Thingiverse page: https://www.thingiverse.com/thing:2668564/files No screws are required to put it together.
Download Model from thingiverse
With this file you will be able to print fan duct with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on fan duct .