build123d 0.10.0
A python CAD programming library
License: Apache-2.0
Requires Python: <3.14,>=3.10
Keywords: 3d models, 3d printing, 3d, brep, cad, cadquery, opencascade, python

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Build123d is a Python-based, parametric [boundary representation (BREP)][BREP] modeling framework for 2D and 3D CAD. Built on the [Open Cascade] geometric kernel, it provides a clean, fully Pythonic interface for creating precise models suitable for 3D printing, CNC machining, laser cutting, and other manufacturing processes. Models can be exported to popular CAD tools such as [FreeCAD] and SolidWorks.

Designed for modern, maintainable CAD-as-code, build123d combines clear architecture with expressive, algebraic modeling. It offers:
- Minimal or no internal state depending on mode,
- Explicit 1D, 2D, and 3D geometry classes with well-defined operations,
- Extensibility through subclassing and functional composition—no monkey patching,
- Standards-compliant code (PEP 8, mypy, pylint) with rich pylance type hints,
- Deep Python integration—selectors as lists, locations as iterables, and natural conversions (Solid(shell), tuple(Vector)),
- Operator-driven modeling (obj += sub_obj, Plane.XZ * Pos(X=5) * Rectangle(1, 1)) for algebraic, readable, and composable design logic.

The result is a framework that feels native to Python while providing the full power of OpenCascade geometry underneath.

The documentation for **build123d** can be found at [readthedocs](https://build123d.readthedocs.io/en/latest/index.html).

There is a [***Discord***](https://discord.com/invite/Bj9AQPsCfx) server (shared with [CadQuery]) where you can ask for help in the build123d channel.

The recommended method for most users to install **build123d** is:

```
pip install build123d
```

To get the latest non-released version of **build123d** one can install from GitHub using one of the following two commands:

Linux/MacOS:

```
python3 -m pip install git+https://github.com/gumyr/build123d
```

Windows:

```
python -m pip install git+https://github.com/gumyr/build123d
```

If you receive errors about conflicting dependencies, you can retry the installation after having upgraded pip to the latest version with the following command:
```
python3 -m pip install --upgrade pip
```

Development install:

```
git clone https://github.com/gumyr/build123d.git
cd build123d
python3 -m pip install -e .
```

Further installation instructions are available (e.g. Poetry) see the [installation section on readthedocs](https://build123d.readthedocs.io/en/latest/installation.html).

Attribution:

Build123d was originally derived from portions of the [CadQuery] codebase but has since been extensively refactored and restructured into an independent system.

[BREP]: https://en.wikipedia.org/wiki/Boundary_representation
[CadQuery]: https://cadquery.readthedocs.io/en/latest/index.html
[FreeCAD]: https://www.freecad.org/
[Open Cascade]: https://dev.opencascade.org/