There’s an entire community based around building Great Ball Contraptions, which are LEGO Rube Goldberg machines ... to show the movement of strain wave gear systems. These types of gear systems ...

It’s so obscure LEGO doesn’t even provide the gear in their online building program LEGO Digital Designer, though (of course) the LDraw folks re-created it — it’s brick 4143 in the ...

This video demonstrates testing the strength of LEGO gears and pulleys by aiming to ... maximum lifting force achievable with this motor, building upon a previous test that reached 100 kg.