Coolerguys 40mm (40x40x20) 12v Ultra Quiet Fan CG4020L12S for Pi Devices, 3D Printers, Arduino

I bought these to use a part cooling fans for my 3Dprinter. They are very quiet, almost completely silent. However, they problem is that they just don't move any air, and that makes them useless as part cooling fans.

Picked this up to get a better hotend cooling fan on my converted Anycubic Mega X. Because Anycubic is no longer supporting the Mega X, I converted the hotend and hotend carriage to the Ender-3 style. I printed a shroud for the conversion and after buying a new carriage I discovered the print I made was designed for a 4020 cooling fan instead of the 4010 stock sized fan. As Ender printers use a 24v power supply, I had already bought a 4010 12v kit to work with the Mega X power supply. This fan replaces that 12v 4010 fan and works fantastically. This fan is going in my saved parts so that I can replace it when the fan wears out.

Very quiet and powerful

This fan comes with the two wire connector. It spins at 3500 RPM but seems to move plenty of air. I don't know why some think it's noisy. I installed it in my 300W inverter and I thought I had a bad fan since I didn't hear it start (the old one was always noisy). It wasn't until I looked at the spinning fan and felt the air movement did I realize it was working. I am well pleased with it.

These look like nice little fans but are not as quiet as I would have liked. However, they are quieter than many fans. I did not measure the sound level.