A small replica of the Mr. Meeseeks box from Rick and Morty, with a functional button! print them apart, and then slide the spring from a pen onto the small peg in the main box. Fit the button into the hole, and make sure the spring goes onto the peg on the button as well. then glue the small slab with the hole in the middle (buttoncapv1actually.stl) on top of the button in the box, making sure not to jam the button. Wait for it to dry, and it should function as expected.