This is a small foam filter. It consist 3 parts, 1. Main body 2. Foam 3. Botom chamber cover. You have to print Main body and Botom chamber cover. Use soft and thick foam to create foam filter. Air inlet dia 5mm and air outlet dia 16mm. Put stone in the botom chamber, then seal the bottom cover to make it water tiight. Use peice of plastic to seal bottom.

Foam dia-40mm and height-35mm.

This is suitable for small aquarium. Specially betta fish tank.

Custom size and design possible. You have to contact with me for more details.

Thanks,Mahbub