NFC Energy-Harvesting Business Card Twenty-one LEDs, no battery, powered by the phone reading it

IVAN BOHUN A website served from four microcontrollers that vote on which one is in charge

morningprint A thermal receipt printer that publishes one edition a day, to an audience of one

Cycloidal Gearbox A fifteen-year-old's 3D-printed 1:9 drive, published with the version that failed and the numbers that prove it

Giant D20 Kit Twenty foam triangles and two bevel cutters, no glue

ChompSaw Power Tool for Kids A finger-safe benchtop power tool that nibbles cardboard into 3D builds