Sterilite 12-Qt Dubtub Adapter: A Test-Fitted 3D-Printable Frame for Modular Mushroom Cultivation Tubs

A 3D-printable adapter joins two Sterilite 12-quart storage tubs rim-to-rim, creating substantially more vertical space for a modular dubtub setup while preserving adjustable perimeter ventilation. The design was dimensioned and physically test-fitted with the Walmart version of the Sterilite container, rather than relying only on advertised measurements. Removable plugs regulate fresh-air exchange, and the split frame uses alignment pins so it can be printed on standard machines such as the Bambu Lab P1S, X1C, and A1. Generous rim-channel clearances accommodate container variation and differences in printer or material tolerances, while avoiding drilling or cutting the tubs. The prototype was printed in PLA, with PETG suggested for greater toughness or temperature resistance. Supports are needed in some areas, and similar containers from other manufacturers may not fit.