Adapter for cheap aquarium ATO fitting
thingiverse
There are cheap ATO fittings you can get off AliExpress or Amazon that hold a water bottle inverted over the top of your aquarium for a cheap version of automatic top off. However, they are designed to sit straight on the edge of glass or acrylic tanks - not on the plastic frame of cheaper aquariums. This adapter fixes that. My tanks are 10 gal so the design may not work on larger sizes if the plastic profile is different. I printed this on an ender 3 with a 0.6 mm nozzle. If you print the part on its side it doesn't require any support.
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