Remember the motorized geared whiplash by OskarPuzzle? Oskar has built a manual version of it. It is made of a set of gears linked together to move kind of like a whip. Each segment drives the next, so the shape can be curled up to a compact size and stretch out.
More gadgets like this: here
You can have this 3D printed for you in various colors. More info is available here.
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