Simple cabinet door latch.
I made this to help keep a loose door from swinging open. It is easy to install, just mount the catch to the cabinet door frame, then mark the mounting point for the ball. If you need some wiggle room, I made an alternate version with slots. This way you don't have to worry about absolute precision.

This prints well in PLA and PETG. The latch does not work in TPU-95 but the ball works really well. It holds tight and comes together slightly easier. The TPU does not make a “Click” when you pull then apart.