The Tyrannosaurus Rex is the first model in the Dino series by Ugears. This mechanical DIY wooden model of a walking tyrannosaur is driven by a metal spring, which transmits power through a reduction gear, turning the axle that drives the legs.
Putting UGears models together is fun and comprehensive: everything you need to build, learn, and discover comes in a box.
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UGears
UGears Tyrannosaurus Rex