Fan Silencer_V1 to any size of fan. STLs for standard sizes of fans are included. If using the openSCAD client instead of the customizer, it will work better using the files in Fan_Silencer_v1_To_Any_Size___importSTL.zip
Print in this orientation with supports only in the centre for the internal cone. Supports with brim is recommended. Adjust support overhang angle if needed.
Slicer settings may need to be adjusted for the smaller sizes. In Cura, enable "print thin walls" and set "Slicing Tolerance" to Inclusive.