Interchangeable Test Tube Rack
thingiverse
Interchangeable test tube rack for high school biology. 4 X 50 mL tubes 12 X 15 mL tubes 12 X 1.5 mL tubes Parts from McMaster-Carr (https://www.mcmaster.com) 1 X M5 bolt; part no. 91290A298 1 X M5 nut; part no. 93625A112 6 X M5 washer: part no. 91116A350 Print without supports. Use 2-3 washers between blocks.
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