Raspberry Pi 4B case
thingiverse
This case is designed for the use of a 40mm fan, and a CPU heatsink. I recommend PLA+ or PET. This case also has a 40mm fan friction fit, a spot to put a small button to be able to turn the raspberry pi on and off, but if you don't want the button there you could always take it to tinkercad and edit it out. Pibottomv2 doesn't have an external hard drive carrier. Even though this is designed to keep the Raspberry Pi cooler, it still could get warm and melt the plastic, so a more heat-resistant filament would be best.
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