I designed this knob to replace the broken one on the tripod foot of my Nikon camera lens. I used photos of the real one to get my CAD model to look the same as the original. I also used fuzzy skin on the print to give the outer surface a texture that matched the original part. I printed my part out of Bambu Lab black PC filament using a 0.2mm Nozzle on a Bambu Lab X1C.

This part is meant to press onto the knurled steel knob of the lens tripod foot and the tolerances are very tight. You may need to scale the model up or down slightly depending on your printer and filament to make this part fit properly.