Test tube rack
thingiverse
A test tube rack I made for work. It holds 2 15ml falcon style tubes, 2 1.8 ml Eppendorf tubes, and 2 .650ml Eppendorf tubes. Most racks only hold 1 size, I needed one to hold 2 or 3 at a time. version for printers that don't do overhangs well. It takes almost no additional material.
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