# FreeCAD — Open Source 3D Parametric Modeler

> FreeCAD is a free, open-source parametric 3D CAD modeler for engineering, product design, architecture, and 3D printing. It supports Python scripting, a modular workbench system, and import/export of standard CAD formats.

## Install

Save as a script file and run:

# FreeCAD — Open Source 3D Parametric Modeler

## Quick Use
```bash
# Ubuntu/Debian (PPA)
sudo add-apt-repository ppa:freecad-maintainers/freecad-stable
sudo apt update && sudo apt install freecad

# Flatpak
flatpak install flathub org.freecadweb.FreeCAD

# macOS (Homebrew)
brew install --cask freecad
```

## Introduction
FreeCAD is a general-purpose parametric 3D CAD modeler. It is designed for mechanical engineering, product design, architecture, and other disciplines that require precise 3D modeling with constraint-based parametric geometry. The project is community-driven and extensible through Python scripting and custom workbenches.

## What FreeCAD Does
- Creates parametric 3D models using constraint-based sketching and feature-based modeling
- Provides specialized workbenches for Part Design, Assembly, Architecture (BIM), FEM analysis, and CNC paths
- Imports and exports STEP, IGES, STL, OBJ, DXF, and other standard CAD formats
- Supports finite element analysis for structural and thermal simulations
- Generates technical drawings with dimensioning and annotations

## Architecture Overview
FreeCAD is written in C++ with Python bindings using PyCXX and Qt for the GUI. The geometry kernel uses Open CASCADE Technology (OCCT) for B-Rep solid modeling. The application follows a workbench architecture where each module (Part Design, Sketcher, FEM, Path) provides its own tools and UI. A document-object model stores parametric features in a dependency graph that recomputes when parameters change.

## Self-Hosting & Configuration
- Download binaries from freecad.org or install via system package managers
- Install additional workbenches through the Addon Manager (Tools > Addon Manager)
- Configure units, navigation style, and display settings in Edit > Preferences
- Set up macro paths for Python automation scripts
- Use the Start workbench to access recent files and tutorials

## Key Features
- Parametric constraint-based sketcher for precise 2D profile creation
- Modular workbench system with Assembly, FEM, Path (CNC), and BIM modules
- Full Python scripting API for automation, macros, and custom workbench development
- Open CASCADE-based geometry kernel supporting advanced B-Rep operations
- Extensible through community add-ons including rendering, fasteners, and sheet metal

## Comparison with Similar Tools
- **Fusion 360** — cloud-based with integrated CAM, but proprietary and requires a subscription for commercial use
- **SolidWorks** — industry standard for mechanical design, but expensive and Windows-only
- **OpenSCAD** — code-based 3D modeling via CSG, but no interactive GUI modeling workflow
- **Blender** — powerful 3D modeling and rendering, but focused on artistic rather than engineering workflows
- **Onshape** — browser-based parametric CAD, but proprietary with limited free tier

## FAQ
**Q: Can FreeCAD handle assemblies?**
A: Yes. The Assembly workbench (integrated in FreeCAD 1.0+) supports multi-part assemblies with mates and constraints.

**Q: Is FreeCAD suitable for 3D printing?**
A: Yes. FreeCAD exports STL and 3MF files and includes mesh repair tools for print preparation.

**Q: Does FreeCAD support Python scripting?**
A: Yes. Nearly every feature is accessible through the Python console and scripting API, enabling full automation.

**Q: What file formats does FreeCAD support?**
A: FreeCAD reads and writes STEP, IGES, STL, OBJ, DXF, SVG, and its native .FCStd format (a zipped XML document).

## Sources
- https://github.com/FreeCAD/FreeCAD
- https://www.freecad.org/

---
Source: https://tokrepo.com/en/workflows/03a3e6b9-3b20-11f1-9bc6-00163e2b0d79
Author: Script Depot