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Freecad MCP
by @ATOI-Ming
GitHub Repo(1 stars)

FreeCAD plugin for automating model creation and control via Model Control Protocol (MCP). Provides a MCP server, GUI panel, and client for running macros, managing documents, and adjusting views.

Created 8/26/2025
Updated 8 months ago
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Repository documentation and setup instructions

FreeCAD MCP Plugin

The FreeCAD MCP plugin integrates the Model Control Protocol (MCP) into FreeCAD, enabling automation of model creation, macro execution, and view management through a server-client architecture. It provides a GUI control panel and a command-line client to streamline FreeCAD workflows, supporting tasks like creating/running macros, adjusting views, and integrating with external tools (e.g., Claude, Cursor, Trace, CodeBuddy).

FreeCAD MCP Icon

Table of Contents

Features

The FreeCAD MCP plugin (v0.1.0) offers the following features:

  • MCP Server: Provides a GUI control panel (FreeCADMCPPanel) and processes commands like create_macro, update_macro, run_macro, set_view, and get_report (implemented in freecad_mcp_server.py).
  • MCP Client: Command-line tool to send commands via stdio or TCP, manage .FCMacro files (create, update, run, validate), and control FreeCAD remotely (implemented in freecad_mcp_client.py).
  • Macro Normalization: Automatically adds imports (FreeCAD, FreeCADGui, Part, math) and post-execution steps (recompute, view adjustment) for macros.
  • GUI Control Panel: Includes buttons to start/stop the server, clear logs, and switch views (front, top, right, axonometric).
  • Logging System: Records messages and errors to freecad_mcp_log.txt in the temporary directory (e.g., %TEMP%\freecad_mcp_log.txt) and a GUI report browser (100-line limit).
  • Workbench Integration: Adds a FreeCADMCPWorkbench with toolbar and menu commands (implemented in InitGui.py).
  • Visual Assets: Includes workbench icon (icon.svg), example models (gear.png, flange.png, boat.png, table.png), and demo animation (freecad.gif, freecad.mp4).

Watch the demo animation: freecad - Freecad MCP by ATOI-Ming Download the demo video: FreeCAD MCP Demo MP4

Quick Start

  1. Install the plugin (see Installation).
  2. Launch FreeCAD and switch to the FreeCAD MCP workbench.
  3. Open the control panel (FreeCAD_MCP_Show) and click "Start Server."
  4. Run an example macro: 
    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --run-macro gear.FCMacro --params '{"radius": 15}'
  5. View the result: A gear model is generated and displayed in axonometric view.

Installation

Prerequisites

  • FreeCAD: Version 0.21 or higher, Download FreeCAD. Select the version for your operating system.
  • Python: Version 3.12+ (included with FreeCAD or installed via Anaconda).
  • Anaconda (recommended for dependency management): Download Anaconda. Select the version for your operating system.
  • Python Dependencies:
    • Required packages: mcp-server>=1.2.0, httpx>=0.24.1 (specified in pyproject.toml).
    • Installation commands: 
      # Create and activate Anaconda environment
conda create -n freecad_mcp python=3.12
conda activate freecad_mcp
pip install mcp-server>=1.2.0 httpx>=0.24.1
# Or use system Python
python -m pip install mcp-server>=1.2.0 httpx>=0.24.1
    • Verify installation: 
      pip show mcp-server httpx
      Ensure mcp-server version is >=1.2.0 and httpx version is >=0.24.1.

Installation Steps

  1. Clone the Repository:

    git clone https://github.com/ATOI-Ming/FreeCAD-MCP.git

  2. Copy to FreeCAD Mod Directory: Copy the FreeCAD-MCP folder to:

    • Windows: D:\FreeCAD\Mod\FreeCAD-MCP
    • Linux: ~/.local/share/FreeCAD/Mod/FreeCAD-MCP
    • macOS: ~/Library/Application Support/FreeCAD/Mod/FreeCAD-MCP
    # Windows example
xcopy FreeCAD-MCP D:\FreeCAD\Mod\FreeCAD-MCP /E /H /C /I

    Note: Adjust D:\FreeCAD\Mod based on your FreeCAD installation path.

  3. Launch FreeCAD:

    • Open FreeCAD and switch to the FreeCAD MCP workbench (icon: assets/icon.svg).
    • Verify that FreeCAD-MCP is loaded in Edit > Preferences > Add-ons.

  4. Verify Installation:

    • Click FreeCAD_MCP_Show to open the control panel.
    • Check the temporary directory (e.g., %TEMP%\freecad_mcp_log.txt) for startup messages.

MCP Configuration

Configure the MCP client to communicate with FreeCAD via stdio or TCP.

  1. Create Configuration File: Create mcp_config.json in D:\FreeCAD\Mod\FreeCAD-MCP-main\src\:

    {
    "mcpServers": {
        "freecad": {
            "disabled": false,
            "timeout": 60,
            "type": "stdio",
            "command": "D:\\Anaconda3\\python.exe",
            "args": ["D:\\FreeCAD\\Mod\\FreeCAD-MCP-main\\src\\freecad_mcp_client.py"]
        }
    }
}

    Note:

    • Adjust paths based on your system:
      • Anaconda Path: e.g., C:\Anaconda3\python.exe (Windows), /home/<user>/anaconda3/bin/python (Linux), /Users/<user>/anaconda3/bin/python (macOS).
      • FreeCAD Mod Path: e.g., C:\Users\<YourUser>\AppData\Roaming\FreeCAD\Mod\FreeCAD-MCP (Windows), /home/<user>/.local/share/FreeCAD/Mod/FreeCAD-MCP (Linux), /Users/<user>/Library/Application Support/FreeCAD/Mod/FreeCAD-MCP (macOS).
    • For TCP communication, set "type": "tcp", add "host": "localhost", and "port": 9876.

  2. Run the Server:

    • GUI Method: In the FreeCAD MCP workbench, click FreeCAD_MCP_Show and then "Start Server."
    • Command-Line Method: 
      conda activate freecad_mcp
python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_server.py

  3. Verify Server:

    • Check %TEMP%\freecad_mcp_log.txt for a "Server started" message.
    • Test a client command: 
      python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --get-report

Usage

GUI Usage

  1. In FreeCAD, switch to the FreeCAD MCP workbench (icon: assets/icon.svg).
  2. Click FreeCAD_MCP_Show to open the control panel (FreeCADMCPPanel).
  3. Use the control panel:
    • Start/Stop Server: Control the MCP server.
    • Clear Logs: Clear the report browser and %TEMP%\freecad_mcp_log.txt.
    • View Switching: Select front, top, right, or axonometric views.
  4. Run a macro:
    • Click FreeCAD_MCP_RunMacro, select an .FCMacro file, and execute it with automatic normalization.

Command-Line Usage

  1. Activate the Anaconda environment: 
    conda activate freecad_mcp
  2. Run client commands: 
    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py <command>
    Examples:
    • Create macro: --create-macro my_macro --template-type part
    • Run macro: --run-macro my_macro.FCMacro --params '{"radius": 10}'
    • Set view: --set-view '{"view_type": "7"}'
    • Get report: --get-report

Tool Functions

The following tool functions are provided by freecad_mcp_client.py, sending commands via stdio or TCP (localhost:9876), processed by freecad_mcp_server.py.

| Function | Parameters | Description | |-----------------------|-----------------------------------------|----------------------------------------------------------------------| | create_macro | macro_name, template_type | Creates an .FCMacro file, validates name (letters, numbers, underscores, hyphens), supports templates (default, basic, part, sketch). | | update_macro | macro_name, code | Updates macro content, auto-adds FreeCAD, FreeCADGui, Part, math imports. | | run_macro | macro_path, params (optional) | Runs a macro, normalizes code, recomputes document, adjusts to axonometric view. | | validate_macro_code | macro_name (optional), code (optional) | Validates macro code syntax, returns success or error (with traceback). | | set_view | params (e.g., {"view_type": "7"}) | Sets view: 1 (front), 2 (top), 3 (right), 7 (axonometric). | | get_report | None | Retrieves server logs (from %TEMP%\freecad_mcp_log.txt and report browser). |

Examples

  • Create Macro:

    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --create-macro gear --template-type part

    Output: {"status": "success", "result": "Macro created"}

  • Update Macro:

    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --update-macro gear --code "import FreeCAD, Part\nradius = 10\ngear = Part.makeCylinder(radius, 5)\nPart.show(gear)"

    Output: {"status": "success", "result": "Macro updated"}

  • Run Macro:

    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --run-macro gear.FCMacro --params '{"radius": 15}'

    Output: {"status": "success", "result": {...}}

  • Validate Code:

    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --validate-macro-code gear --code "import FreeCAD\nApp.newDocument()"

    Output: {"status": "success"}

  • Set View:

    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --set-view '{"view_type": "7"}'

    Output: {"status": "success", "result": "view set to axonometric"}

  • Get Report:

    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --get-report

    Output: {"status": "success", "result": {...}}

Use Cases

  1. Automated Gear Model Creation:

    • Scenario: Generate a parametric gear model for engineering design.
    • Steps:
      1. Create macro: --create-macro gear --template-type part
      2. Update macro: --update-macro gear --code "import FreeCAD, Part\nradius = 15\ngear = Part.makeCylinder(radius, 5)\nPart.show(gear)"
      3. Run macro: --run-macro gear.FCMacro --params '{"radius": 15}'
    • Result: Gear model generated, displayed in axonometric view.
    • Output: Gear Model

  2. Generating a Flange Model:

    • Scenario: Automate creation of a flange with holes for mechanical design.
    • Steps: Run macro: --run-macro flange.FCMacro
    • Result: Flange model generated with automatic normalization.
    • Output: Flange Model

  3. Text-Based Model Generation:

    • Scenario: Generate a boat model from a text description (e.g., "create a boat with a curved hull").
    • Steps:
      1. Use Claude to generate boat.FCMacro.
      2. Run macro: --run-macro boat.FCMacro
    • Result: Boat model generated with automatic view adjustment.
    • Output: Boat Model

  4. CAD Drawing Recognition:

    • Scenario: Recreate a table model from a CAD drawing.
    • Steps:
      1. Use Trace to convert drawing to table.FCMacro.
      2. Run macro: --run-macro table.FCMacro
    • Result: Table model generated.
    • Output: Table Model

  5. Batch Processing Models:

    • Scenario: Automate creation of multiple models (e.g., gear and flange).
    • Steps: 
      for macro in gear.FCMacro flange.FCMacro; do
    python D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py --run-macro $macro
done
    • Result: Models generated sequentially, logged to %TEMP%\freecad_mcp_log.txt.
    • Output: See gear.png and flange.png.

External Tool Integration

FreeCAD MCP supports integration with external tools to enhance model generation:

  • Claude: AI model for generating .FCMacro files from text descriptions.
    • Example: Input "create a gear with 10mm radius," generates: 
      import FreeCAD, Part
radius = 10
gear = Part.makeCylinder(radius, 5)
Part.show(gear)
      Save as gear.FCMacro, run: --run-macro gear.FCMacro.
  • Trace: CAD drawing processing tool to convert drawings to .FCMacro files.
    • Example: Convert a table drawing to table.FCMacro, run: --run-macro table.FCMacro.
  • Cursor/CodeBuddy: Code editing tools for writing and debugging macro code.
    • Example: Edit flange.FCMacro in Cursor, update: --update-macro flange.FCMacro --code "<code>".

Assets

The assets/ directory contains the following resources:

  • icon.svg: Icon for FreeCADMCPWorkbench, used in InitGui.py and package.xml. FreeCAD MCP Icon
  • gear.png: Example gear model. Gear Model
  • flange.png: Example flange model. Flange Model
  • boat.png: Example boat model. Boat Model
  • table.png: Example table model. Table Model
  • freecad.gif: Demo animation showing GUI panel, macro execution, and view switching. Demo Animation
  • freecad.mp4: Demo video, available for download. Download: FreeCAD MCP Demo MP4

Troubleshooting

  • Server Fails to Start:
    • Issue: Port 9876 is in use.
    • Solution: Check port (netstat -ano | findstr 9876), change port, or terminate conflicting process.
  • Client Connection Failure:
    • Issue: Incorrect paths in mcp_config.json.
    • Solution: Verify command and args paths, e.g., D:\Anaconda3\python.exe and D:\FreeCAD\Mod\FreeCAD-MCP-main\src\freecad_mcp_client.py.
  • Macro Execution Errors:
    • Issue: Syntax errors or missing imports in macro code.
    • Solution: Use --validate-macro-code to check code, review traceback in %TEMP%\freecad_mcp_log.txt.
  • Log File Not Generated:
    • Issue: No write permission in temporary directory.
    • Solution: Check permissions for %TEMP%\freecad_mcp_log.txt, or specify another path in freecad_mcp_server.py.
  • More Help: Submit issues on GitHub (Bug Tracker).

Contributing

Contributions are welcome! Follow these steps:

  1. Fork the repository: https://github.com/ATOI-Ming/FreeCAD-MCP.
  2. Create a branch: git checkout -b feature/your-feature.
  3. Commit changes: git commit -m "Add your feature".
  4. Push and create a Pull Request.

For questions or collaborations, please open an issue or contact [1757772673@qq.com,抖音：huhushuxue95]

License

This project is licensed under the MIT License. See LICENSE for details.

Quick Setup
Installation guide for this server

Install Package (if required)

uvx freecad-mcp

Cursor configuration (mcp.json)

{ "mcpServers": { "atoi-ming-freecad-mcp": { "command": "uvx", "args": [ "freecad-mcp" ] } } }
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