Ceiling switch adaptor.

thingiverse

A perfectly sized washer shapes up for the task at hand: making the replacement of an outdated 80mm ceiling pull switch a seamless process when swapping it out for a sleek new 70mm model. Printing time is remarkably short, just a few minutes, and this clever solution ensures that any unsightly old plaster ring disappears from view. A simple yet ingenious approach, leaving little more to be said.