Potentiometer (volume control) knobs

I picked up a used "gaming chair" that didn't have any knobs for the volume or tone controls, so decided to design and print my own. Since it's more fun to share, I figured I would make these available for everyone. Enjoy!

Variety of knobs for standard potentiometers using 1/4 inch shaft, round or slotted ("D-shaped").

15, 20, and 30 mm diameter knobs with openings for set (grub) screws. Variations of knobs with and without index marker 180 degrees opposite the flat portion of the shaft/set screw.