Classic Bubble-Up Box Filter -w- Suction Cup Bottom
thingiverse
Once again designed for use with activated carbon & cotton-ball wadding in the small hydroponic / aquarium environment. We remixed matten79's air-stone to great effect: https://www.thingiverse.com/thing:2507701 Suction cup hole is 7mm to allow 8mm nipples to pass thru nicely... Standard 24 - 30mm suction cups should work with this print as-is.
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