build123d is a Python-based parametric modeling framework for 2D and 3D CAD.
Built on the Open Cascade geometric kernel, it lets users define precise parts and assemblies with readable Python code instead of relying on a traditional interactive CAD interface. The project is aimed at engineering and fabrication workflows, with tools for creating accurate models for tasks such as 3D printing, CNC machining, and laser cutting.
This is free and open source software.
Key Features
- Provides builder mode, algebra mode, and a direct API for different CAD scripting styles.
- Offers explicit 1D, 2D, and 3D geometry and topology classes with well-defined operations.
- Supports selectors, locations, and operator-driven composition for concise parametric model creation.
- Includes joints and assemblies for building multi-part mechanical designs.
- Provides 2D and 3D import and export capabilities for broader CAD workflows.
- Integrates well with Python tooling, including rich type hints and standards-compliant code.
- Ships with extensive documentation, tutorials, examples, and a cheat sheet.
Website: github.com/gumyr/build123d
Support:
Developer: Gumyr
License: Apache License 2.0
build123d is written in Python. Learn Python with our recommended free books and free tutorials.
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