This is a replica of an old Westinghouse Tube Type Radio Knob with added set screw hole for #6 or 3mm set screw.
iPRINT 3D, HATCHBOX, Tianse, etc. PLA
Brown, Black or what ever suits.
Extruder temp at 220ºC, bed temp at 45ºC, and fan at 32% after bottom layers are printed. FR set < 60% for first layer.