More and more 3d printers are coming with 24 volt fans… which can be a problem because 24v fans can be hard to find. Here is how you can attach a 12 volt Noctua fan.
If you want a great, quiet hot-end fan… look no further than the Noctua (NF-A4x10 FLX). It is 12volt, practically silent, and comes with some handy adaptors.
The OmniJoin adaptor is the black connector in the first photo with 2 wires attached. You’ll also need:
- a cheap buck converter
- a 2 pin JST plug (for the printer end)
- soldering iron
- multi meter
- Solder the positive and negative wires from the JST connector to the input terminals of your buck converter.
- Ensure the printer is off, connect your multi-meter to the output terminals of the buck converter (set the multimeter for DC voltage)
- Plug in the jst cable to your hot end fan header
- Power up the printer, and check the voltage on the multimeter. Use a small flathead screw driver to adjust the buck converter voltage down to 12volts
- Power down the printer, disconnect the buck converter and solder the OmniJoin adaptor to the output terminals of the buck converter
- Mount the buck converter near your hot end. Note that you will need to insulate the back of it if you are fixing it on a metal surface. Electrical tape is fine for this.
You are now able to run 12 volt fans on your printer.
Adjusting the voltage
Buck converter in place