40mm O.D. dual test tube to suction cup adapter
thingiverse
I was running low on test tubes in my setup, so this one holds 2 tubes in a compact setup. requires: 2x M3 nuts 2x M16 bolts 2 suction cups This design is based on the same file as the single test tube holder for aquariums found here: https://www.thingiverse.com/thing:3544071
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