Firewalla Gold Fan Cooler (Fan with Enclosure)
thingiverse
My Firwewalla gold would periodically experience errors and was quite hot. This enclosure uses four 20 or 30mm screws along with a USB fan to keep it cool. Works great, total parts about $10. I kept the interior spacing large enough to allow for good air flow, so this is not a tight fight for the Firewalla.
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