Spirograph Letter Set — S, I, J, U
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3D Printable Spirograph-Compatible Alphabet
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- Creative Commons — Attribution — Noncommercial
A set of 3D printable letters designed to work as a spirograph track. Each letter has gear teeth compatible with the included spirograph wheels, so you can use a pen to draw intricate spirograph patterns directly along the letter shapes.
Letters included: S, I, J, U, C Each letter features:
Sinusoidal gear teeth with adaptive amplitude — slightly shallower on concave sections for smoother wheel travel
Pin holes along the centerline for fixing the letter to paper with pushpins (random diameters 0.8–1.5 mm)
2 mm thickness for easy printing and lightweight use
Wheels included: 9 wheels with 17, 19, 23, 29, 31, 37, 41, 47 and 53 teeth All wheels are coprime with all letters — guaranteeing the most complex possible spirograph patterns before the path repeats. Each wheel has:
A central axle hole (⌀1.5 mm)
Multiple pen holes (⌀2 mm) at varying radii
2 mm thickness
Tooth profile: sinusoidal, pitch 2.2 mm, amplitude 1.2 mm (wheels) / adaptive 1.1–1.6 mm (letters) — measured from a real Spirograph wheel for compatibility with original Spirograph sets.