I printed the original print but was disappointed with the mechanism so I redesigned the whole thing to be spring-loaded
You should print 2x cases, 1x toggle, and 1x mechanism
I used springs from mechanical pencils, two is ideal but it still works pretty well with just one
to assemble, put the toggle in the top of the case then put the mechanism under it with the wholes facing away from the toggle, put the springs in to the mechanism and case, then put the other case on top
I used superglue to hold both sides together but it isn't required, and be careful not to accidentally superglue the springs
The author remixed this model.