120mm Fan Mount for 2020 Extrusion

This is a printable mount for a 120 mm fan on 2020 extrusion, made to replace a noisy 50 mm stepper-driver fan with a larger, quieter fan at lower RPM.

Download and status (October 2026): The files were released to Patrons on Patreon. A snap-in version for 2020, 2040 and 4040 is free: 120mm fan mount for 2020/2040/4040.

Hi all,

just a small update with this 120mm fan mount.

I created this mount for my Two Trees Sapphire S, that I'm upgrading to have another printer for printing Fenrir parts.

I've upgraded the mainboard and added a BTTpi with Klipper, and the original 50mm fan for cooling the stepper drivers had bad bearings, and was noisy before they went bad as well, so a larger fan at lower RPM will be better both in air flow and noise levels.

This should be usable for other printers as well, so I thought it might be interesting for other projects. Hopefully you'll find a use for it. STL file is attached below. :)

Thanks,
Thomas