A lens cap holder for two lens caps, one in 58mm size and one in 67mm.
The camera's strap is passed through the body of the holder and is held in place by the pressure applied lightly on the strap by the holder.
The most often used kit lens for consumer DSLR cameras from makers like Canon is a 18-55, with a 58mm lens cap.
The 3mf file is a project file from PrusaSlicer, with support on the three posts that hold the strap (to make sure they keep their shape) and at the bottom, around the lip of the opening.)
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The author marked this model as their own original creation.