This is a Lens Mount Ring that I made for a S3 IS Canon Camera, it can be inserted into the Lens Cap to fit it to the Camera.
OnShape Link:
https://cad.onshape.com/documents/da8a863576a61729d6491d48/w/228502a05c6ecbc648cb255d/e/22226dccd133903b32780a08?renderMode=0&uiState=65ad333cab972d5c4fa4b08b
The author marked this model as their own original creation.