This is a simple floating feeder I designed for freshwater shrimp. Works best with sinking foods like pellets. Floating design makes it easy to access or remove uneaten food and provides a great viewing area for feeding times. High walls help keep food from falling into substrate and getting lost (that's how you get detritus worms). Drop in a few pellets and enjoy the show.

Set wall thickness to 4. Set infill to 40%. No support needed. I used standard PLA.