3D MCP Server

MCP server for AI-driven 3D model generation using OpenSCAD. Create, combine, transform, and export 3D models through natural language via any MCP-compatible AI client.

Installation

npm install -g @jagjerez-org/3d-mcp-server

Prerequisites

Install OpenSCAD for export and preview rendering:

# Ubuntu/Debian
sudo apt install openscad

# macOS
brew install openscad

# Windows — download from https://openscad.org/downloads.html

Note: OpenSCAD is only required for export and preview tools. Scene building and SCAD code generation work without it.

Quick Start

With Claude Desktop

Add to your Claude Desktop config (~/.config/claude/claude_desktop_config.json):

{
  "mcpServers": {
    "3d": {
      "command": "3d-mcp-server"
    }
  }
}

Then ask Claude: "Create a box with a cylindrical hole through the center and export it as STL"

With Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "3d": {
      "command": "3d-mcp-server"
    }
  }
}

Tools

Primitives

| Tool | Description | |------|-------------| | create_primitive | Create cube, sphere, cylinder, cone, or torus | | create_text | Create 3D extruded text | | create_polyhedron | Create custom mesh from vertices and faces | | custom_scad | Add raw OpenSCAD code directly |

Transformations

| Tool | Description | |------|-------------| | transform | Translate, rotate, scale, mirror, or color an object |

Boolean Operations

| Tool | Description | |------|-------------| | boolean_op | Union, difference, or intersection of multiple objects |

Extrusions

| Tool | Description | |------|-------------| | linear_extrude | Extrude 2D shape (circle, square, polygon) into 3D | | rotate_extrude | Create solid of revolution from 2D profile |

Scene Management

| Tool | Description | |------|-------------| | status | Check OpenSCAD installation and scene info | | scene_list | List all objects in the scene | | scene_clear | Clear the entire scene | | remove_object | Remove a specific object |

Output

| Tool | Description | |------|-------------| | get_scad | Get the full OpenSCAD source code | | save_scad | Save scene as .scad file | | export | Export to STL, OBJ, 3MF, AMF, OFF, DXF, SVG, CSG | | preview | Render a PNG preview image |

Examples

Box with hole

AI: "Create a 30x30x10 box with a 5mm radius hole through the center"

→ create_primitive(shape: "cube", width: 30, depth: 30, height: 10)
→ create_primitive(shape: "cylinder", radius: 5, height: 12)
→ boolean_op(operation: "difference", objectIds: ["abc", "def"])
→ export(format: "stl")

Phone stand

AI: "Make a phone stand at 60 degrees"

→ create_primitive(shape: "cube", width: 80, depth: 50, height: 5, name: "base")
→ create_primitive(shape: "cube", width: 80, depth: 5, height: 100, name: "back")
→ transform(objectId: "...", operation: "rotate", x: -60)
→ boolean_op(operation: "union", objectIds: [...])
→ preview()
→ export(format: "stl")

Gear

AI: "Create a simple gear with 12 teeth"

→ custom_scad(code: "...", name: "gear")
→ preview()

Environment Variables

| Variable | Default | Description | |----------|---------|-------------| | OPENSCAD_BIN | openscad | Path to OpenSCAD binary | | SCAD_WORK_DIR | /tmp/3d-mcp-work | Working directory for files |

How It Works

1. Scene graph — Objects are tracked in memory with unique IDs
2. OpenSCAD codegen — Each operation generates clean OpenSCAD code
3. Boolean CSG — Objects combine via union/difference/intersection
4. Export — OpenSCAD CLI renders the final SCAD to STL/PNG/etc.

The AI builds models step by step: create shapes → transform → combine → export.

License

MIT