Worm Compost Bin Cover

Our worm composting system only shipped with a single cover tray, and running a healthy vermicomposting setup needs more airflow and coverage than one tray provides. Rather than buy an additional OEM tray at a markup, I reverse-engineered the original part in SolidWorks — matching its exact perforation pattern, finger-recess grips, and vent slot geometry — so it could be reproduced as needed.

The cover needed to replicate the original's function closely: dense ventilation holes for airflow into the bin, raised grip divots for lifting trays without disturbing the compost, and slotted vents along the ridges for additional gas exchange.

The part was modeled from measurements taken directly off the original tray — hole spacing, diameter, and the counterbored lip around each perforation were all matched so the finished part would sit and stack identically to the factory piece. The raised oval divots along the ridgelines replicate the original's finger-grip points for lifting trays out of the stack.

Printed in ASA filament for the same reason as my other outdoor parts — the cover lives in a garage/outdoor composting setup and needs to hold up to UV exposure and temperature swings without becoming brittle.