40mm O.D. dual test tube to suction cup adapter

40mm O.D. dual test tube to suction cup adapter

thingiverse

I needed more test tubes in my setup, so this one holds 2 tubes in one setup. requires: 2x m3 nuts 2x m3 16mm bolt 2 suction cups this is the same file design as the single test tube holder for aquariums here: https://www.thingiverse.com/thing:3544071

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