Cam cap 10mm is for a lot of AIO cams with a lens diameter of 10mm.

Cam cap 9mm is for cams with a lens diameter of 9mm, i.e. Caddx Ant and similar.

Cam cap Nano3 is for the Runcam Nano3, here, it's holding on to the inner ring, as the lens has got a funny shape.

Cam cap Runcam is for a Runcam Nano2 or any cam with a 12mm diameter lens.

Cam cap Cam Mount is for a cool AIO cam mount available at Thingiverse: https://www.thingiverse.com/thing:3601191

Use soft filament, and set the seam to random in your slicer, to prevent splitting.
If the fit is too loose of too tight, just slightly alter the size in your slicer.

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