Cap cooler
thingiverse
I wanted a straightforward cap cooler, powered by a 5v 40mm fan plugged into a USB battery pack. I simply threaded the wire through my hat and down my shirt to a battery bank in my back pocket. As this fan only draws about 200mA of power, it can run for an extended period even on small battery packs. Edit: On September 8th, 2019, I added a v2 cap clip that keeps the fan closer to the cap.
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