I made cooling fan adjuster for SNAPMAKER Original .
Now I can print PETG/ABS more easier than stock snapmaker.
Rotary switch and 11 diodes step down the fan drive voltage and off-mode.
please check thingiverse.
I just find good and cheep rotary switch in Japan.(I am Japanese)
However, how your country?
If you know good and easy to obtain rotary switch , Please share the information and modify 3D model.
STEP and Fusion360 format files in Thingiverse.