build123d-cad-drafting-skill

What problem does it solve?

build123d allows engineers to draft CAD models programmatically with builder modes, semantic selectors, and MJCF-compatible boolean strategies, providing a repeatable, rule-based workflow for complex mechanical designs.

Core Features & Use Cases

• Builder-mode CAD construction using BuildPart, BuildSketch, and boolean operations with strict dimensioning and metadata patterns.
• Semantic selectors and placement rules to reduce manual coordinate tuning and avoid hard-coded indices.
• MJCF-compatible assembly and motor/machine-translation guidance enabling safer, manufacturable prototypes and simulations.
• Use cases include rapid parametric prototyping, constraint-driven assembly planning, and design-for-manufacturability verification.

Quick Start

Plan and execute a parametric CAD task using build123d by defining inputs, selecting primitives, applying constraints, and exporting a final assembly.