This is a little charging station for your AirPods (2nd Gen/Pro). The pegs at the back are to push out the case once the AirPods are charged. Almost all of the pieces are friction fitted, but you can put some glue on the visor and base piece for extra strength.
The files without AirPods Pro in the name are for the 2nd gen AirPods. The same pegs are used for each model though.
Edit (2/14/21)- Two new files (bigger tolerance) if the regular tolerances are too tight for your printer to handle.
The author hasn't provided the model origin yet.