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.

Shrimp Gazebo

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Shrimp Gazebo