Raspberry Pi 3 (B/B+) Case w/ 40mm Fan
thingiverse
They've incorporated provisions for a 40mm fan for cooling purposes, featuring a vent that extends downwards along one side. This setup performs optimally when paired with a heatsink that is carefully aligned in a perpendicular configuration relative to the length of the Raspberry Pi. Moreover, they've added a hexagonal pattern to the underside of the device because it presented an aesthetically pleasing appearance to them.
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