Raspberry PI4 fan case
thingiverse
Two part raspberry pi4 case with choice of cover, which can be either with 20mm or 40mm fan. Fans are to be connected to gpio expansion port to 5v and GND. If you use 12V 40mm fan (not all of them work, some need a bit of a push to start spinning) it is very silent but it cools raspberry nicely. For overclocking, use 5V 40mm fan. Use 4 m3x12mm screws from below to secure the case together. Depending on fan size use appropriate screws to screw them into upper part from below, I've used 40x10mm fan and also 20x6mm.
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