TAGGED
Stem
3 designs tagged “Stem”.
Toys & mechanisms / Mechanical
Wand Through the Wall — a Straight Wand Passes Through a Curved Slit
A dead-straight wand on a little turntable swings clean through two CURVED slits in a wall, twice per turn, without bending. The wand is skew to the axis, so it sweeps a hyperboloid; the wall cuts that in a hyperbola, and that is the slit. Four flat supportless parts, formula engraved on the base.
Toys & mechanisms / Puzzles
Tower of Hanoi — Parametric Educational Stacking Puzzle
Classic recursion puzzle: move a graduated stack of discs across three pegs, one at a time, never a bigger disc on a smaller one. Parametric (n_discs 3–9, default 5); print each disc a different colour for a rainbow set and the base in wood-fill PLA for the grain shown. Kid-safe: smallest disc above the choke gauge, every edge filleted. Prints flat, no supports.
Toys & mechanisms / Mechanical
Desk Gyroscope — two-axis gimbal flywheel (a toy, not a tool)
A heavy-rim flywheel spinning in a two-axis gimbal on a pedestal — pull the string and the spin axis holds its direction while you tilt the base. A desk toy and physics demonstrator, nothing more.