Cordless drill fan.
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Previously:
https://www.homemadetools.net/forum/...417#post122196
https://www.homemadetools.net/forum/...807#post229461
https://www.homemadetools.net/forum/...981#post224210
https://www.homemadetools.net/forum/...107#post172306
https://www.homemadetools.net/forum/...443#post139045