Fingerdigger
thingiverse
The desktop version of this sandbox toy lets you use your fingers to control actions like searching for fossils in potted plants or transferring sake from one sakazuki to another. It requires a small amount of glue on thin pegs to fit inside thicker ones. This design is inspired by Sean H Kim's desk digger (http://grabcad.com/library/desk-digger-1), aiming for the "Two Bed Manifesto," which means creating articulated children's toys that can be easily printed on a single bed without support, allowing you to wake up to new fun for your kids.
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