I whipped this up after downloading another knob that needed the original Ender 3 knob glued to it. I personally rather potentially ruin a printed knob than the one that came with the printer.

3D PRINTING SETTINGS

Print Time: 20-30mins, depending on profile settings and slicer
Layer Height: 0.12mm-0.28mm, this is a personal preference for quality.
Nozzle Temp: 200-210c, again this depends on the filament used. I used Overture PLA Pro @ 210c Bed Temp: 60c