This uses a simple micro switch, a piece of PTFE tubing (64mm) and a couple of 8mm M3 screws to create a nice and simple switch to control things like a garage door.

The switch is fairly sensitive, but shouldn't trigger without someone pressing it.

Creality

Ender 3

No

No

0.2mm

20%-30%

You don't need supports at all. I included an example slice of the parts in prusa slicer using adaptive layer height to get a nice finish on the button.

Cut the PTFE to length (64mm), and when you are ready to assemble it. Push the PTFE tubing it into the lid, put one side into one hole in the box, and push the other end in, lining it up to snap into place. It should be pretty much locked in after that. But do your wiring first, not sure how hard it will be to remove the lid.