This thing is a simple wall-mounted tray that I designed for our flock of ducks. The ducks need to consume oyster shell to help with their egg production and had been making a mess of our existing system so I came up with this to keep things a bit more tidy in the run.

The tray is a simple design that is easy to print without supports! I printed in ABS, but any sunlight and heat tolerant material should be fine.