Simple Prusa i3 Fan Rework
thingiverse
If you have on of the cheapest kits of Prusa i3, you'll may find this fan duct useful and SIMPLEST rework that adds little cooling near the hot-end, it is not a perfect solution, and should be replaced later with better and global rework. Instructions Sorry, for better printing the part should be rotated so the part would stand on the fan mount.
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With this file you will be able to print Simple Prusa i3 Fan Rework 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 Simple Prusa i3 Fan Rework.