I'm trying to upload a Thing-a-day this February.
A Turner's Cube is a machined curiosity that used to be shown to a novice machinist. Their task was to (a) figure out how to re-create the object and (b) operate machinery with enough skill to re-create it.
Other Turner's Cubes on Thingiverse:
Day 8: Turner's cube. thingiverse.com/thing:6003
Day 7: Cupcake XY autohoming GCode thingiverse.com/thing:6200
Day 6: Cupcake CNC Optoendstop Trigger for X Minimum thingiverse.com/thing:6191
Day 5: Things That Cannot Be Unseen. thingiverse.com/thing:6097
Day 4: Extruder to Stepper mounting plate. thingiverse.com/thing:6106
Day 3: A shelving unit bracket. thingiverse.com/thing:6001
Day 2: A mirror bracket. thingiverse.com/thing:6000
BONUS THING: A Helen Weight. thingiverse.com/thing:6024
Day 1: A bathroom hook. thingiverse.com/thing:5999