Portable Battery Powered Fan

I've built a battery powered fan that can be used for almost anything, anywhere.

Need to solder something and don't want these nasty fumes in your face? Need a cool breeze in the Summer? Some extra ventilation in a room?

A portable fan is the answer.

You'll need:

1. 3D printed parts - makerspaces and libraries often offer cheap 3D printing services
2. 120mm Fan - max thickness is 28mm, all standard 120mm PC fans will fit
3. Battery and Holder - preferably, 21700 else 18650
4. Power Switch - round 15mm diameter
5. Step-Up-Converter - MT3608
6. Battery Charging Board - TP4056 with usb-c
7. 4x M3 Screws - the base is designed in a way that allows most screw length, I used 8mm
8. Soldering Iron
9. Multimeter
10. Wire

Print out the box and test fit the components. If everything fits nicely, we can start step two.

I was a bit impatient and already soldered a few wires before taking a picture, sorry for that

Solder everything, but the fan and measure the voltage at Vout- and Vout+ of the Step-Up-Converter. Set it to or below the voltage of your fan by turning the bronze colored pin. If you set it below the recommended value, the fan will spin slower and more quietly. I went with 11 volts, however that's just personal preference.

Next, we connect the fan. No matter what kind of fan you are using (PWM or DC) we only need the VDC and GND wire. Check the images to see what kind of fan you have and what wires to leave out.

Put in the battery, the screws and charge it if needed.

The charging board will light up red while charging and blue once the battery is full. It also got important protective features that prevent your battery from over- or undercharging, it will keep it between the save values of 3.0 and 4.2 volts.

Flip the switch and take your fan wherever you need it. Fan Voyage!