RighteousWaffles' Raspberry Pi 4 30mm fan bracket

thingiverse

There are several very nice Pi 4 cases popping up on Thingiverse, but this one doesn't quite cut it. I wanted to see just how much of an impact active cooling would have on the Pi 4 temps, so I slapped together a quick and dirty cooling fan bracket to find out. This baby clips onto the top of the official Raspberry Pi 4 case. I built this with a 30mm fan because that's what I happened to have lying around. To be honest, I'm not even sure where I scored this thing - all it says is Sheng Feng 5v @ 0.19a on the label. No idea about the flow rate, though. The ambient temp was sitting pretty at 24.9ºC, and the Pi had zero heat sink to speak of. I logged the CPU temp at four different stages: (1) no fan while idle, (2) no fan under load, (3) with fan at idle, and (4) with fan under load. Check out this graph - it shows just how much a fan can cool down your Pi. In my case, it shaved off about 17ºC of heat under load. If you're struggling to keep your Pi 4b from hitting its thermal ceiling, toss this handy bracket on it and let the proper cooling begin while you print up a custom case with a built-in fan.