Stackable Box/Feeding Trough...

thingiverse

This is a 100x100x50mm stackable box, it's primarily for the Hungry Cattle challenge at PiWars 2022 but I thought making them stackable would mean I could reused them afterwards to reduce waste. For competitors, if you use the colour change command in your slicer at the half way point you can print in a line that will help the judges see you've filled with enough feed.