Slim test tube rack with compartments
thingiverse
Remixed version without compartments here: https://www.thingiverse.com/thing:4653089 A test tube holder designed for aquarium test kits. There are slots for 6 tubes, and four extra compartments for storage. Pictured are 16\*50mm tubes - I've measured the print itself with calipers and the tube rack holes are ~16.5mm in diameter. I think this design should be compatible with NTLabs tubes but I don't have the original NTLabs tubes anymore, so please measure your tubes before you print. Standard 12*75mm tubes such as the API glass tubes will fit, but obviously they will sit loosely in the rack. NOTE: I recommend you seal the finished product in some way - a lot of 3D prints aren't watertight due to the layering, and you'll find water 'weeps' through the infill in that case.
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