Dishwasher sign that attaches to the dishwasher (or other magnetic surfaces).

The magnet compartment fits a magsafe magnet: https://www.aliexpress.com/item/1005004925924694.html

The backside plate and the casing fit together with a ring, they can be joined easily with some superglue this way.

Print the front casing with supports. Organic supports from the buildplate work.