A 3D-printable fidget toy with a screw-like mechanism. The central threaded shaft rotates inside a matching helical body, providing smooth tactile motion. Print upright for proper thread geometry, 0.2 mm layers, 0.4 mm nozzle, 10–15 % infill. PLA works well; PETG for more durability. Minimal post-processing may be needed to clean threads for smooth rotation.

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