81 - Fan duct for 80mm PC fan (CC-BY)

thingiverse

Fan duct for a 80mm computer fan. Comes in lengths 255mm, 239mm, 240mm. <a href='https://ko-fi.com/T6T4DXTSD' target='_blank'><img height='36' style='border:0px;height:36px;' src='https://cdn.ko-fi.com/cdn/kofi4.png?v=3' border='0' alt='Buy Me a Coffee at ko-fi.com' /></a> ### Why My living room computer in a shelf got quite warm and I needed a way to get the warm air out of the shelf. ### Design Details There is a difference in outside texture of the duct because I imported the original into a CAD program and then added a circle on top of it to have the duct longer. Since I don't use it for decoration purposes, I'm okay with that. Can be combined with the [Customizable Fan Grill Covers by OutwardB](https://www.thingiverse.com/thing:4837562) to prevent fingers being hurt. ## Print Instructions Print upright. I don't recommend scaling in Z because the base for the 80 mm fan might get too thin. Reducing the line width might reduce print time largely. For the outside wall, I changed the wall line width from 0.4mm to 0.35mm and went from 24h print time to 12 hours. Tests prints with the shorter fan duct did not show and difference in wall strength at 100% wall flow. Designed for FDM printing. ### Materials Needed (none) ### Assembly Instructions None, but ... I mounted a computer case fan to the fan duct, Then, I connected a case fan extension cable to a case fan connector on the computer motherboard. After that, I routed the cable through a (3D-printed) PCI cover plate to the outside and connected the fan from the fan duct. In the BIOS I set the fan trigger to <i>motherboard</i>. That way, the air in the shelf will be sucked out if the motherboard thinks the air is too warm and the fan stays off if it is cold enough. <a href='https://ko-fi.com/T6T4DXTSD' target='_blank'><img height='36' style='border:0px;height:36px;' src='https://cdn.ko-fi.com/cdn/kofi4.png?v=3' border='0' alt='Buy Me a Coffee at ko-fi.com' /></a> (If you like what I'm doing you can [Support me on Ko-Fi](https://ko-fi.com/T6T4DXTSD)) [nn Jun 2023]