Thingiverse
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CGTrader
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Radius Finder 3D Printable Models
Radiusgauge
Thingiverse
crdn_tmn
Radius Finder / Mesure de Rayon
Thingiverse
ADR-Industrial-Drawing
Radius Gauges (R1-25 mm) and Thickness Gauges (1-10 mm)
MakerWorld
Brigs164