South Pointing Chariot – Mechanical GPS Differential Gear 3D Model

Model Overview & Print Notes

This 3D model represents the legendary South Pointing Chariot, an ancient Chinese mechanical navigation device often described as the world’s first mechanical GPS. The model demonstrates a differential gear system that keeps the pointing arrow facing a constant direction regardless of how the wheels turn — a fascinating educational example of mechanical engineering principles. This design is ideal for: STEM education Mechanical demonstrations Historical engineering displays 3D printed functional models The model has been optimized for 3D printing, cleaned, and packaged for easy assembly. Originality & Credits This product is based on the South Pointing Chariot design by Matt Keveney, licensed under the BSD 2-Clause License. Modifications, optimization, and packaging by Beshoy Kamel. ## 3D Printing Settings Recommended Technology FDM 3D Printing Recommended Materials PLA (easy printing) PETG (stronger & durable) Print Settings Layer height: 0.2 mm Infill: 15–20% Perimeters: 3 Supports: Not required Print orientation: As provided Nozzle: 0.4 mm Assembly Instructions Clean all moving parts before assembly Ensure free rotation of gear shafts Do not apply glue on rotating joints Light lubrication improves motion Full assembly guide can be created using Cadasio Estimated Print Time 6–10 hours depending on printer and material

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