Test Tube and Reagent Rack

thingiverse

A simple rack to hold test tubes, reagent bottles, and papers (instructions sheets, color chart cards, etc.) for aquarium water testing. Test tube pockets are 14mm inside, reagent bottle pockets are 26x46 elliptical (which fit the test kits my partner has). Anyone with a salt water or reef aquarium has to do water tests (nitrates, phosphates, alkalinity, carbonate hardness, etc.) on a regular basis, and it's much easier to have all the pieces together and held upright for easy access, than have to fight with the original test kit boxes I overdesigned a bit, few if any aquarium keepers will have enough bottles or tubes to fill up this rack -- and it's still fairly compact and, with 20% infill, only uses about 250g of filament.