Step Python Packages

cadquery

A python parametric CAD scripting framework based on OCCT

pytest-steps

A tiny package to ease the creation of test steps with shared intermediate results/state.

ada-py

A python library for structural analysis and design

cadgen

Give your agent CAD superpowers.

draftwright

Automated technical-drawing generation for build123d and STEP files

openbim-ifc

Pure-Rust IFC model, codecs, schema metadata, validation, and typed domain projections

f3d

Fast and minimalist 3D viewer.

volmdlr

A python VOLume MoDeLeR computations-oriented with STEP support for import/export

dcc-mcp-freecad

FreeCAD MCP adapter for AI agents to create and validate parametric documents, edit primitives and booleans, and exchange CAD geometry through FreeCADCmd in the DCC-MCP ecosystem.

partcad

Package manager for things. Start designing modular hardware! PartCAD is the standard for documenting manufacturable physical products (a.k.a. Digital Thread or TDP). It comes with a set of tools to maintain product information and to facilitate efficient and effective workflows at all product lifecycle phases, boosted by AI.

bdbox

A workshop for build123d models with live preview and interactive parameters

cqkit

A python library of CadQuery tools and helpers for building 3D CAD models.

partcad-cli

Package manager for things. Start designing modular hardware! PartCAD is the standard for documenting manufacturable physical products (a.k.a. Digital Thread or TDP). It comes with a set of tools to maintain product information and to facilitate efficient and effective workflows at all product lifecycle phases, boosted by AI.

cqgridfinity

A python library to build parameterized gridfinity compatible objects such a baseplates and boxes.

simplecadapi

An agent-native CAD SDK for language models to create, inspect, and reconstruct complex, editable 3D models.

wrenchroom

Checks that a real hand tool can reach, turn and remove every fastener in a mechanical assembly. STEP in, verdicts out: terminal, JSON, exit codes for CI.

cq-editor

CadQuery GUI editor based on PyQT

stepscribe-cad

Turn STEP CAD files into AI-readable context packs: exact dimensions, holes, cutouts, fasteners, assembly relations, joints, weak spots and labelled images. Runs offline. Works with any AI chat, Claude Code (plugin), Copilot and MCP clients.

pygments-step

Pygments lexers for EXPRESS (ISO 10303-11) and STEP Part 21 (ISO 10303-21)

diff3d

Fast visual 3d diff for STL, OBJ, 3MF, and STEP files

breptile

Convert STL meshes to clean, editable STEP BREP models — analytic surface reconstruction, not tessellated dumps

caddiff

git diff for CAD assemblies — two STEP files in, a picture of what changed plus a machine-readable change list out.

ifc-spf

Read IFC-SPF (STEP) files with the Python standard library — instances, property sets, quantities, units. No geometry kernel, no compiled dependency.

breakform-cli

Breakform — Break the format. Keep the truth. Open interoperability layer for engineering data: schema, converters, honest fidelity reports.