Cap Spinner – Functional Spinning Propeller Hat Attachment

Turn an ordinary baseball cap into a fun spinning propeller hat with this removable 3D-printable Cap Spinner. The system mounts directly onto the fabric-covered button on top of a baseball cap using four flexible capture arms. No glue, screws, magnets, or permanent modification to the hat are required. The propeller rotates around a printed central spindle and is secured using a removable quarter-turn retainer. Different cap-button sizes are supported through interchangeable sizing adapters. Ma…

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