I've designed this modular compost cabinet to replace my old expanded polystyrene boxes (yes, those fish boxes), 41cm long, 28cm width and 16cm high. Designed with a grid on the bottom to allow worms to move through the boxes contains a long bar to ensure stability.

All parts have been designed to be printed in a Ender 3, none of them are bigger than 20cm and can be printed and assembled to complete a 41cm x 28cm box.

I recommend only use fruits and non cooked vegetables, also grass or leaves from your garden, keep it humid and add some worms, and you'll get a really good fertilizer!

I'll be designing more parts, a 8 or 10cm high module and improvements if I find some faults on this design.

I've also designed a cover with pot holes to be used with this compost bin: https://www.thingiverse.com/thing:3519500