Spinner Twirligig
thingiverse
A living-hinge model featuring interlinked rings showcases an impressive spinning motion along its central axis when the panel is folded. The model spiner.stl boasts four concentric rings, while spinner2.stl has eight, with hinges denoted by depressions on one side or the other. To avoid confusion in folding directions, follow the guideline of forming a chevron or "arrowhead" pointing towards the spinning direction of each ring's middle hinge. Ideal for flexible materials like PVC, nylon, or paper, this model is being developed into a 3D-printable rigid version compatible with ordinary cardstock. For comprehensive folding instructions, refer to this video: http://youtu.be/yzMhYPm88WY.
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