Rubbermaid water bottle cap

Had a couple of these bottle caps break at the hinges, and finally decided to do something about it when I dropped one and sprayed stuff everywhere. These aren't *perfectly* watertight, so don't stick them in a bag upside down, but they're not too bad.

Yes, I'm aware of the [debate about food safety and 3D printing](https://pinshape.com/blog/3d-printing-food-safe/). I'm not concerned with this particular application. If you are, either don't use it or cast it with an appropriate material.