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.
Related Software
| CAD Software | |
|---|---|
| FreeCAD | 3D-Solid and general purpose design CAD/CAE |
| QCAD | Professional CAD System |
| LibreCAD | CAD in two dimensions |
| BRL-CAD | Constructive Solid Geometry (CSG) solid modeling system |
| OpenCASCADE | Technology, 3D modeling & numerical simulation |
| SALOME | Platform for numerical simulation |
| OpenSCAD | Programmers solid 3D CAD modeller |
| KiCad | Integrated environment for all of the stages of the design process |
| LeoCAD | Design virtual models you can build with LEGO bricks |
| SolveSpace | Parametric 3d CAD tool |
| CadQuery | Python parametric CAD scripting framework |
| Electric | The Electric VLSI Design System |
| gCAD3D | 3D CAD-CAM application which features an integrated 3D OpenGL viewer |
| XTrackCAD | CAD program for designing model railroad layouts |
| KLayout | Viewer and editor for integrated circuit and mask design |
| Dune 3D | Parametric 3D CAD |
| CAD Sketcher | Constraint-based geometry sketcher |
| build123d | Python CAD programming library |
| Design | 2D CAD software for GNOME |
Read our verdict in the software roundup.
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