A basic lens cap for the Sigma DP1 point & shoot. Clicks into the bayonet on the front when the lens is retracted to keep dust & etc off/out of the lens when stored.
Do NOT power on camera with cap installed, I haven't personally tried so I can't tell you whether or not it'll break it, but let's not find out the hard way.
I personally printed mine on a Bambu P1S on the .08mm super fine preset so it'd look nicer, but whatever should work as long as your machine is decently in spec, just make sure it'll comfortably be able to print the bayonet itself, which is only 1mm thick. I'd suggest printing with the outside face on the bed - I printed the one in the picture with it facing up, & ironing on so it'd look nice for the photo, but removing the supports are a massive pain.
The author marked this model as their own original creation.