Giant Printable Tourbillon - Working Swiss Lever Escapement, Spring Driven, 19 cm Display Movement

A tourbillon is the most famous complication in watchmaking: the whole escapement - balance wheel, hairspring, lever and escape wheel - sits in a rotating cage so gravity errors average out. This is a giant, fully printed, spring-driven one you can watch working: a 106 mm balance swings once a second, the Swiss lever ticks, and the gold cage steps round once a minute like a seconds hand, pointing at a blue seconds ring. Wind it with the key at the back and it runs on its own. Everything that mo…

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