mcp-stl

MCP server for editing STL 3D model files. Provides tools for parsing, viewing, and manipulating STL files through the Model Context Protocol.

Install

pip install mcp-stl

MCP Server

mcp-name: io.github.daedalus/mcp-stl

Tools

Reading & Writing

• read_stl_file: Read an STL file and return mesh data (vertices, normals, bounding box)
• get_mesh_info: Get summary information about an STL file without loading full geometry
• write_stl: Write mesh data to an STL file (ASCII or binary format)

Transformations

• translate_stl: Translate (move) the mesh by specified X, Y, Z offsets
• rotate_stl: Rotate the mesh around X, Y, or Z axis by a given angle in degrees
• scale_stl: Scale the mesh by specified X, Y, Z factors

Primitives

• create_cube: Create a cube mesh
• create_sphere: Create a sphere mesh
• create_cylinder: Create a cylinder mesh
• create_cone: Create a cone mesh
• create_torus: Create a torus (donut) mesh
• create_plane: Create a plane mesh

Usage

Python API

from mcp_stl import read_stl_file, create_cube, translate_stl

# Read an existing STL file
mesh = read_stl_file("model.stl")
print(f"Faces: {mesh.face_count}")

# Create a primitive
create_cube("cube.stl", size=2.0)

# Transform a mesh
translate_stl("input.stl", "output.stl", x=10.0, y=0.0, z=5.0)

MCP Server

Configure in your MCP client:

{
  "mcpServers": {
    "mcp-stl": {
      "command": "mcp-stl"
    }
  }
}

Development

git clone https://github.com/daedalus/mcp-stl.git
cd mcp-stl
pip install -e ".[test]"

# run tests
pytest

# format
ruff format src/ tests/

# lint
ruff check src/ tests/

# type check
mypy src/