Aquarium Sponge Filter

OverviewThe custom sponge filter is built using parts likely already available for aquarium owners including ¼" airline tubing, o-rings, and rocks. Complete this low-cost build to have extra sponge filters that can be used for any aquarium including quarantine tanks. Materials and PrintingWe suggest using PETG since it is aquarium-safe. Black would be a nice color to use to blend in with other equipment. For the designer print profile, we have omitted unnecessary supports from the parts.Infill: 20%Walls: 3 (prevent water intrusion)Support: enabled (needed for hanging surfaces) AssemblyRequired PartsFilter CapAir Lift TubeAir DiffuserDiffuser CoverRock Box4.5" of ¼" OD airline tubing (not including tubing attached from the filter cap to the air pump)0.9" OD o-ring (optional)Begin by filling the rock box with gravel larger than the gaps on the side of the box.Insert an o-ring in the diffuser cover groove. This o-ring is used to ensure air does not leak out but is an optio