What started as a chonky setup with multiple springs and a manually-actuated mechanism eventually was whittled down to a single spring, some pins, and four magnets as vitamins for the 3D printed ...

Again, because they only shell out a few pieces at a time, 3D-printed ones help with portion control. Plus, they just look cool. No two people decorate their living spaces the same way.

[Angus] of [Maker’s Muse] recently got interested in 3D printing small mechanical assemblies that can be put together by folding them up, and also depend on folding linkages for the moving parts.