Working Tower Crane Model - Worm Slewing Ring, Trolley, 4-Fall Hoist, 3 N20 Motors or Hand Cranks

A working hammerhead tower crane that you print yourself: about 455 mm tall with a 334 mm jib, in classic yellow with red and black details, on a small construction-site base. All three crane motions really work, each on its own small N20 gear motor (or a printed hand crank that drops into the same motor pocket): the upper works slew a full 360 degrees on a printed ball slewing ring, the trolley runs along the jib, and the hook block goes up and down on a 4-fall rope. Three toggle switches on t…

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