MCP 3D Printer Server

Community

Connect MCP clients to major 3D printers for STL/3MF editing, slicing, and printing.

★ 233 Stars Category · Other Very popular

53FMRS · D

This server bridges MCP clients to multiple 3D printer management systems, covering status queries, file management, print control, and fairly complete STL editing, slicing, and visualization, with Bambu Lab 3MF printing, FULU OrcaSlicer-bambulab integration, and bridge diagnostics. It is community-maintained rather than vendor-official, licensed under GPL-2.0, and supports the local stdio and streamable-http transports. It suits users who want to drive print workflows in natural language, but it requires printer credentials and LAN access, STL handling of large files strains memory, and the Bambu FTP channel and model-preset configuration carry real risks, while some features (such as Bambu real-time status and FULU macOS slicing) still have known limitations.

Reliability

9/20

Security and permissions

8/20

Maintenance

11/20

Documentation

14/20

Setup experience

11/20

Read the FMRS scoring method →

This is a Model Context Protocol (MCP) server that connects MCP clients to several 3D printer management systems: OctoPrint, Klipper (via Moonraker), Duet, Repetier, Bambu Lab, Prusa Connect, and Creality Cloud. It can read printer status and temperatures, list files on the printer, upload G-code, start and cancel print jobs, and set temperatures. It also offers substantial STL manipulation: scaling, rotation, translation, base extension, vertex merging, centering, laying flat, section-specific edits, detailed analysis, and multi-angle SVG visualization. It can slice STL files into G-code with an external slicer, confirm temperature settings in G-code, and upload a sliced 3MF to a Bambu Lab printer via FTP to start a job over MQTT, auto-slicing unsliced 3MF files with FULU OrcaSlicer-bambulab or Bambu Studio when a project slicer is configured. The Bambu integration also provides FULU runtime setup inspection (check_fulu_orca_setup), guarded FULU BambuNetwork bridge RPC calls (fulu_bambu_network_rpc), and resources for reading Bambu Studio presets. The server supports stdio and streamable-http local transports, requires Node.js 18 or higher, and is licensed under GPL-2.0.

Tools

get_stl_info

Get detailed information about an STL file, including dimensions, vertex count, and bounding box.

extend_stl_base

Extend the base of an STL file by a specified amount.

scale_stl

Scale an STL model uniformly or along specific axes.

rotate_stl

Rotate an STL model around specific axes in degrees.

translate_stl

Move an STL model along specific axes in millimeters.

merge_vertices

Merge vertices closer than a specified tolerance, helping close small gaps.

center_model

Translate the model so its bounding box center sits at the world origin (0,0,0).

lay_flat

Attempt to identify the largest flat surface and rotate the model so it faces down on the XY plane (Z=0).

modify_stl_section

Apply a transformation to a selected section (top, bottom, center, or custom bounds) of an STL file.

generate_stl_visualization

Generate multi-angle SVG visualizations of an STL file (front, side, top, and isometric views).

slice_stl

Slice an STL file to generate G-code using an external slicer.

confirm_temperatures

Confirm temperature settings in a G-code file.

process_and_print_stl

End-to-end workflow: process an STL (extend base), slice it, confirm temperatures, and start printing.

get_printer_status

Get the current status of the 3D printer (temperatures, print progress, etc.).

list_printer_files

List files available on the printer.

upload_gcode

Upload G-code content or a local G-code file path to the printer.

start_print

Start printing a file that is already on the printer.

cancel_print

Cancel the current print job.

set_printer_temperature

Set the temperature of a printer component.

check_fulu_orca_setup

Inspect the FULU OrcaSlicer-bambulab executable, platform runtime payload, setup commands, and optionally probe the BambuNetwork bridge.

fulu_bambu_network_rpc

Call one FULU BambuNetwork bridge JSON RPC method; read-only methods are allowed by default, mutating methods require explicit opt-in, and print methods also require bambu_model.

print_3mf

Upload a sliced .3mf file via FTP and start the print job on a Bambu printer via MQTT, optionally auto-slicing first.

blender_mcp_edit_model

Blender bridge tool with an optional execution mode for model-edit collaboration workflows.

Setup

Ensure Node.js 18 or higher is installed.
Install globally with npm install -g mcp-3d-printer-server, or from source via git clone, npm install, and npm link.
Create a .env file in the directory where you run the server or set environment variables (API_KEY, PRINTER_HOST, PRINTER_PORT, PRINTER_TYPE, and for Bambu also BAMBU_SERIAL, BAMBU_TOKEN, BAMBU_MODEL).
Add an mcpServers entry to your MCP client config with command npx and args ["-y", "mcp-3d-printer-server"], putting printer connection values in env.
Restart your client (for Codex, run /mcp or codex mcp list to confirm the server loaded).
Alternatively run with Docker and Docker Compose: copy .env.example to .env, then run docker-compose up --build -d; install slicers inside the container rather than mounting host executables.

claude_desktop_config.json

{
  "mcpServers": {
    "3dprint": {
      "command": "npx",
      "args": ["-y", "mcp-3d-printer-server"],
      "env": {
        "PRINTER_HOST": "your_printer_ip",
        "PRINTER_TYPE": "bambu",
        "BAMBU_SERIAL": "your_printer_serial",
        "BAMBU_TOKEN": "your_access_token",
        "BAMBU_MODEL": "p1s",
        "SLICER_TYPE": "orcaslicer-bambulab",
        "SLICER_PATH": "/path/to/FULU/OrcaSlicer",
        "FULU_ORCA_PLUGIN_DIR": "/Applications/OrcaSlicer.app/Contents/MacOS"
      }
    }
  }
}

Generate and validate client config

Fit and risk

Best for

Users with OctoPrint, Klipper, Duet, Repetier, Bambu Lab, Prusa, or Creality printers
Users who want to drive printing and model workflows from an MCP client in natural language
Technical users needing an end-to-end modify-STL, slice, and print workflow
Bambu users using FULU OrcaSlicer-bambulab or Bambu Studio as the project slicer

Not for

Users without any supported printer or printer management system
Users unwilling to provide printer credentials (API keys, access tokens, serial numbers)
Users expecting to override slicer settings such as layer height or temperature directly from MCP (must be done before generating the 3MF)
Users expecting complete real-time streaming Bambu status semantics (status reading remains limited)
Bambu users without Developer Mode and LAN Only Mode enabled or whose printer is not on the same network

Required permissions

API key or Bearer token for the printer management system
Bambu Lab serial number (BAMBU_SERIAL) and access token (BAMBU_TOKEN)
Network access to the printer's local network (including Bambu MQTT port 8883 and FTPS port 990)
Read/write access to the local filesystem for STL, G-code, and 3MF files and the temp directory
Ability to launch external slicer executables (SLICER_PATH) and optionally the FULU bridge command
Optional MCP_ALLOW_EXECUTABLE_ARG=1 to accept per-call local executable selectors

Risks and side effects

STL operations load entire models into memory; large files (e.g., over 10MB) can cause out-of-memory issues
Bambu file operations may use unsecured plain FTP, exposing transfers to network eavesdropping
A wrong Bambu model preset (bambu_model) can generate dangerous G-code and cause the bed to crash into the nozzle and damage the printer
Allowing per-call executable paths (MCP_ALLOW_EXECUTABLE_ARG) lets untrusted input choose which local program runs; enable only for trusted diagnostics
Tool output should be treated as untrusted input, so prompt injection is a risk and destructive operations should have human confirmation gates
Credentials are stored as environment variables in client config, so a leak grants printer control

Troubleshooting

Verify Node.js is version 18 or higher
Check that PRINTER_HOST, PRINTER_PORT, PRINTER_TYPE, and API_KEY/token are correct
For Bambu, confirm BAMBU_SERIAL, BAMBU_TOKEN, and BAMBU_MODEL are set and that Developer Mode and LAN Only Mode are enabled
Make sure the printer and the machine running the server are on the same local network
If slicing fails, check SLICER_TYPE, SLICER_PATH, and the slicer command's stderr output
When using FULU OrcaSlicer-bambulab, call check_fulu_orca_setup first to inspect the runtime payload and install commands
On macOS, FULU CLI slicing may crash or leave uninterruptible processes; SLICER_TYPE=bambustudio is the known-good fallback
If a probe or slicing tool reports an executable-argument error, check whether MCP_ALLOW_EXECUTABLE_ARG is set
Confirm the client config file location is correct and restart the client after edits

Use cases

Query printer status, temperatures, and print progress in natural language

List, upload, and manage G-code files on the printer

Modify STL models with scaling, rotation, translation, and base extension

Slice STL files and confirm G-code temperatures

Print sliced 3MF files on Bambu Lab printers

Generate multi-angle SVG visualizations of STL models

Read Bambu Studio machine, filament, and process presets

Supported clients

Claude DesktopFull support

Claude CodeFull support

CursorFull support

CodexFull support

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