PWM DC Motor Speed Controller in-line box
thingiverse
Small in-line box for PWM DC Speed Controller. Here is a link to a unit similar to the one I used: https://www.ebay.ca/itm/DC-3V-35V-5V-6V-9V-12V-18V-24V-5A-PWM-DC-Motor-Speed-Controller-LED-Fan-Dimmer/263088431291?hash=item3d414ae0bb:g:2D4AAOSwpINZZ38q
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