CentauriMCP

A Model Context Protocol (MCP) server for safe, controlled remote operation of the Elegoo Centauri Carbon 3D printer.

⚠️ Safety First

This project provides controlled access to 3D printer operations with built-in guardrails:

• Temperature monitoring - Auto-pause on thermal anomalies

• Error detection - Monitors for filament runout, jams, motor failures

• Rate limiting - Prevents rapid-fire commands

• Audit logging - Every operation logged with timestamp and result

• Pre-command validation - Verifies safe state before executing operations

Never leave a 3D printer unattended while printing. This tool assists with monitoring and control but does not replace proper safety practices.

Related MCP server: 3D Printer MCP Server

Features

Phase 1: Read-Only Monitoring ✅

• Real-time printer status (temperatures, position, state)

• Live camera feed access

• File listing (available prints)

• Print history retrieval

• Error code monitoring

Phase 2: Controlled Operations 🚧

• Pause/Resume/Stop print jobs

• Start prints (with validation)

• Fan speed control

• Print speed adjustment

Architecture

• Protocol: SDCP v3.0.0 (Smart Device Control Protocol) over WebSocket

• Connection: ws://{printer-ip}:3030/websocket

• Language: Python 3.10+

• MCP SDK: TypeScript MCP SDK reference implementation

Installation

# Clone the repository
git clone git@github.com:zant0p/CentuariMCP.git
cd CentuariMCP

# Install dependencies
pip install -r requirements.txt

# Configure environment
cp .env.example .env
# Edit .env with your printer's IP address

Configuration

Create a .env file with your settings:

# Printer Configuration
PRINTER_IP=192.168.1.41
PRINTER_PORT=3030
MAINBOARD_ID=000000000001d354

# Safety Limits
MAX_NOZZLE_TEMP=300
MAX_BED_TEMP=110
COMMAND_RATE_LIMIT_MS=2000

# Logging
LOG_LEVEL=INFO
LOG_FILE=centauri-mcp.log

Usage

Running the MCP Server

python -m centauri_mcp.server

Example MCP Client Configuration

{
  "mcpServers": {
    "centauri": {
      "command": "python",
      "args": ["-m", "centauri_mcp.server"],
      "env": {
        "PRINTER_IP": "192.168.1.41"
      }
    }
  }
}

Available Tools

Once connected to an MCP client, you can use:

• get_printer_status() - Current temperatures, position, state

• get_camera_snapshot() - Live camera image

• list_files() - Available print files

• get_print_history() - Historical print jobs

• pause_print() - Pause current print

• resume_print() - Resume paused print

• emergency_stop() - Stop print immediately

• start_print(filename) - Start a print job (with validation)

API Reference

For detailed SDCP protocol documentation, see:

• OpenCentauri API Docs

• SDCP Protocol Specification

Security

• SSH key-based authentication for Git access

• No credentials stored in repository

• Local network only (no cloud exposure)

• Deploy keys scoped to this repository only

Development

Branch Strategy

• main - Production-ready code

• dev - Active development and testing

Testing

# Run tests
pytest tests/

# Test WebSocket connection
python -m centauri_mcp.test_connection

Known Issues

• Protocol field names contain spelling errors (e.g., CurrenCoord, RelaseFilmState) - must use exact spellings from spec

• Video streaming limited to 1 concurrent connection by default

License

MIT License - See LICENSE file for details

Contributing

1. Fork the repository

2. Create a feature branch (git checkout -b feature/amazing-feature)

3. Commit your changes (git commit -m 'Add amazing feature')

4. Push to the branch (git push origin feature/amazing-feature)

5. Open a Pull Request to dev branch

Built with ❤️ for safe 3D printer automation

Last updated: 2026-07-12