Shelly Lock Pro magnetic battery cover replacement. Blends in almost perfectly.

Requires two 3mm thick 3mm diameter neodymium magnets to keep attached (similar to original one). Check magnet orientation before pushing in.

I printed it from PET-G using 0.15mm layer height on 0.4mm nozzle. No supports required.

That was a fun project since I recreated it without access to original part, using a scan of pencil-sketched outline as shape source.