7 inch filter case for pet fountain
thingiverse
We got a [pretty awesome pet fountain](https://www.amazon.com/gp/product/B0C65JYRX9/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) that held like 6 or 7 liters of water, and it had this massive round filter that Amazon doesn't carry for some reason. So I fired up Shapr3D and got jiggy. This is basically just a container for activated carbon. You can find bags of it on Amazon, usually for aquariums - [I got like 6 pounds of it for $23](https://www.amazon.com/gp/product/B01EJ454HG/ref=ox_sc_act_title_1?smid=A39G1UAOFK1OOE&psc=1). The aquarium carbon works well because the pieces are small enough to work well as filter medium but still too big to fit through the filter's openings. One of the sides has a 12mm lip while the other has a 9mm. Fill up the 12mm side and use the 9mm as the lid. it's just a pressure fit to keep the two halves together, but it's done pretty well on my end. Let me know if you have any trouble with it.
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