The BEST battery powered fan

thingiverse

I had the same, store bought, (18650) battery powered fan for 5 years and used it almost daily. It was a great fan, but I wanted a bit more... Using my original fan as a baseline, I wanted: Longer battery life Higher CFM output Greater customization of the fan's speed The ability to charge other devices (built in battery bank) So, this is what I came up with. Using the parts listed, this fan: Has a 7,000mah battery bank built-in to either run the fan, charge an external device, or both Will output around 73 CFM Has a rotary knob to adjust the speed with a relatively long throw (distance from 0-100%) Additional details: You can charge the fan while using it/while charging another device The fan will run on high for around 8 hours (high really puts out a lot of air) The USB A output will output up to a 2.4 amp charge The fan can be charged via USB C -or- Micro USB The Micro USB port can also be used as output to Rapid Charge a phone (Android for me) Parts needed: This dual 18650 PCB This DC motor speed controller This DC step up boost converter This pack of standoffs (You'll need a handful) Two of these 18650 batteries (you can use others, but I HIGHLY recommend these) This pack of DC motors This pack of 4" rotors (I recommend these, but any 4" rotor will work. Less than 4", you won't get near the same output) This 2mm to 5mm motor output shaft adapter This knob (any knob for a split, 6mm shaft potentiometer will work - Check out SwedenKnobs on Etsy for some really cool knobs!) Additional things you will need: Soldering iron/solder Heat shrink Hot glue gun/hot glue -or- some sort of plastic safe adhesive (I don't recommend super glue for this project) Some scrap 20-24 gauge wire (You should only need maybe 6 inches of both positive and negative wires) 10 M3 screws (2: 6mm, 2: 25mm, 6: 10mm) Some stick-on rubber feet for the bottom (Optional, but I recommend for grip and vibration absorption/sound dampening)