API Test tube holder
thingiverse
A Simple Test Tube Holder for Aquarium Water Testing Kits This handy holder is designed to keep test tubes organized and within easy reach when testing aquarium water using the API master test kit. The holder can accommodate four test tubes and a color chart, making it an essential accessory for any serious aquarist. The design is deliberately kept simple to ensure quick printing, with a build time of just one hour. I'm also excited to share another DIY project: a Drying Rack, available on Thingiverse at https://www.thingiverse.com/thing:4153699
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