I have drawn it for my "FLUVAL Spec 5 Nano 21", but it should be adaptable to almost any nano aquarium.
- v3 Is thinner walled and faster to print. Performance is the same unfortunately it is much louder, one hears a constant gargling. - v4 Being thick-walled and printing is a bit longer. But extremely quiet and no gargling. At the moment I use this version, because my aquarium is at the desk. - v5b Slightly modified v4 to make it printable without support. - v6 New and 3D printing optimized version. The time to print is reduced by half.
p.s. .: what is that: https://en.wikipedia.org/wiki/Airlift_pump I use a Piezo Mini Air Pump ("Cambani Mini Piezo Air Pump For Fish Tanks", should not be an advertisement)