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Wednesday, February 25, 2026

Python 3.13.0 : build123d the BREP for 2D and 3D CAD.

build123d is a Python-based, parametric boundary representation (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.
You can find more about this project on the GitHub repo.
python -m pip install build123d
Collecting build123d
  Downloading build123d-0.10.0-py3-none-any.whl.metadata (6.7 kB)
...
Successfully installed anytree-2.13.0 asttokens-3.0.1 build123d-0.10.0 cadquery-ocp-7.8.1.1.post1 cadquery_ocp_proxy-7.9.3.1 cadquery_vtk-9.3.1 decorator-5.2.1 executing-2.2.1 ezdxf-1.4.3 ipython-9.10.0 ipython-pygments-lexers-1.1.1 lib3mf-2.5.0 matplotlib-inline-0.2.1 ocp_gordon-0.2.0 ocpsvg-0.5.0 pure-eval-0.2.3 stack_data-0.6.3 svgelements-1.9.6 svgpathtools-1.7.2 traitlets-5.14.3 trianglesolver-1.2 webcolors-24.8.0