Sponge Filter for aquarium

the sponge filter is designed for suction cups to be added. It's also possible to put the base of the filter under a small layer of substrate. it should work fine with most small cylindrical airstones and has tested to be good in my shrimp aquarium.

it takes a relatively good printer tune and some fan to get the “grll” to print nicely. once printed 3 segments of old sponge can be used in a way that a hole is cut through every one. The sponges then slide onto the filters shaft and its ready for use.