Ender 3 Pro PSU Cover honeycomb 80mm fan

thingiverse

I've designed a custom PSU cover for my Ender 3 Pro with an 80mm hole, inspired by Skrycchio's fanless honeycomb design. I chose to remix it because I wasn't comfortable running without a fan. Inside the PSU, there isn't enough space for a larger fan, so I mounted it on the outside. A 12V Noctua 80x25 fan works great and produces far less noise when it kicks in. While following the original design with closed housing and vents might improve cooling performance, opening up the entire front face with honeycomb may encourage more passive cooling. Either way, the fan still turns on and off during prints as needed, so it's doing its job just fine. One thing to keep in mind is that my Noctua 2-pin adapter has a swapped polarity compared to the PSU board header. If your fan doesn't turn on even during printing, this is likely the culprit!