# Epicyclic Planetary Gearset Calculator & .DXF/.STL Studio

Design concentric Sun, N-Planet, and Internal Ring epicyclic gearboxes enforcing Zr = Zs + 2*Zp and symmetric planet indexing with instant .DXF & 3D .STL export.

## Engineering Geometry & Export Specification
- Automatically verifies both concentricity Zr = Zs + 2*Zp and symmetric planet assembly (Zs + Zr)/Np = integer plus adjacent planet tip clearance.
- CAD Outputs: 0.005mm AutoCAD R12 `.DXF`, `.SVG`, Watertight 3D Binary `.STL` (4–40mm face + hub boss + bore), and `1:1` Printable `.PDF`.
- Pricing: Free Spec Proof PDF ($0) · Single CAD Pack ($11.90) · Mechanical Engineer Pro ($19.00/mo).
- Live Interactive Workbench: https://gearcadpro.com/templates/planetary-gear-calculator-cad-generator.html