The first actually functional (as in, successful) design I've made with the 3D printer is a little bin that precisely holds exactly the medication I take every day. As in, the whole blister packs; I won't post in-use photos because I don't need weirdos online diagnosing me, but it's a box with exactingly cut slots that they can fit into.
This is kind of completely useless except for the psychological trick of making sure things are returned to where they belong by making them fit neatly into other things. But it opens up the vista of, what if your entire life was filled with things that fit neatly into other things.
