Natural Language CAD Generation And Validation

Problem Context

When an engineer requests a “M4 mounting hole, 3 mm wall thickness, rounded bracket” part, hand-writing build123d or CadQuery code can miss units, coordinate datums, boolean order, and feature parameters. txt-to-cad is not for concept renders; it turns natural-language requirements into inspectable parametric CAD models, with STEP as the primary editable artifact.

How It Works

The skill follows a fixed workflow:
- Task classification: new parts, assemblies, source modifications, geometry inspection, or secondary STL, 3MF, and GLB exports.
- Parametric modeling: dimensions become named variables; build the main solid first, then add or remove material, and apply fillet and chamfer late.
- Generation and validation: produce STEP, GLB, and topology data, then check faces, edges, vertices, bounding box, main planes, and positioning.
- Snapshot review: visually verify hole locations, ribs, bosses, shells, and fillets against intent.

Boundaries

It fits mechanical parts, brackets, enclosures, fixtures, and geometry validation; it does not cover CAM toolpaths, FEA conclusions, engineering certification, architectural BIM, or freehand illustration. For 2D technical drawings, use a separate DXF workflow instead of expecting standard drafting output here.