This is a  combination test tube stand and reagent bottle organizer, with space in the back for instruction pamphlets, color cards, etc.  It'll be of use to anyone who keeps either tropical or salt water aquariums and has to do water tests routinely.

Print with 3 walls and low infill (10% is plenty).

Water Test Tubes and Reagents Stand

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Zeiss Ikon

Water Test Tubes and Reagents Stand