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brs077

3DP MCP Server

by brs077
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Python
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3DP MCP Server

MCP server that gives Claude the ability to create 3D-printable CAD models using build123d. Outputs STL/STEP files ready for slicing in Bambu Studio.

Also available as a Claude Code plugin — install it and all 33 tools are automatically available.

Install as Plugin (Recommended)

Add the marketplace and install the plugin from within Claude Code:

/plugin marketplace add brs077/3dp-mcp-server
/plugin install 3dp-mcp-server@3dp-tools

The plugin will automatically set up a Python virtual environment and install dependencies on first use. Requires Python 3.11+.

Plugin Skills

Once installed, Claude gains six agent skills:

  • design-model — Design 3D-printable CAD models with build123d

  • modify-model — Shell, split, add text, combine, transform, and generate 2D drawings

  • parametric-components — Create enclosures, gears, snap-fits, hinges, dovetails, and labels

  • mechanical-parts — Create threads, fasteners, bearings, sprockets, flanges, pipes, OpenBuilds parts

  • print-prep — Analyze printability, suggest orientation, estimate filament/cost, pack build plates

  • publish-model — Publish to GitHub Releases, Thingiverse, MyMiniFactory, Cults3D, or search for models

Related MCP server: CAD-Query MCP Server

Manual Setup (Alternative)

git clone https://github.com/randypitcherii/3dp-mcp-server.git
cd 3dp-mcp-server
make install

As a Claude Code Plugin

claude plugin add /path/to/3dp-mcp-server

The plugin auto-registers the MCP server via .mcp.json.

Manual MCP Registration

claude mcp add 3dp-mcp-server -- uv run --directory /path/to/3dp-mcp-server threedp-mcp

Tools (40)

Core

Tool

Description

create_model

Execute build123d code, auto-exports STL + STEP

export_model

Export to STL, STEP, or 3MF

measure_model

Bounding box, volume, face/edge counts

analyze_printability

Watertight check, thin wall detection, build volume fit

list_models

List all models in current session

get_model_code

Retrieve the code used to create a model

Transform & Combine

Tool

Description

transform_model

Scale, rotate, mirror, or translate a model

combine_models

Boolean union, subtract, or intersect two models

import_model

Import STL or STEP file from disk

Modification

Tool

Description

shell_model

Hollow out a model with optional open faces

split_model

Split a model along a plane

add_text

Emboss or deboss text onto a model face

create_threaded_hole

Add threaded or heat-set insert holes (M2-M10)

Analysis & Export

Tool

Description

estimate_print

Estimate filament usage, weight, and cost

analyze_overhangs

Find overhang faces needing support material

suggest_orientation

Suggest optimal print orientation

section_view

Generate 2D cross-section as SVG

export_drawing

Multi-view 2D technical drawing as SVG

split_model_by_color

Split into separate STLs for multi-color printing

Utility

Tool

Description

shrinkage_compensation

Scale model to compensate for material shrinkage

pack_models

Arrange models on build plate for batch printing

convert_format

Convert between STL, STEP, 3MF, BREP

Parametric Components

Tool

Description

create_enclosure

Electronics enclosure with snap/screw lid and features

create_gear

Involute spur gear (via bd_warehouse)

create_snap_fit

Cantilever snap-fit joints

create_hinge

Two-part pin hinge assembly

create_dovetail

Male or female dovetail joints

generate_label

3D-printable label with text and optional QR code

Mechanical Parts (bd_warehouse)

Tool

Description

create_thread

ISO metric, ACME, metric trapezoidal, or plastic bottle threads

create_fastener

Screws, nuts, washers, heat-set inserts (14 types)

create_bearing

Ball bearings, roller bearings (5 types)

create_sprocket

Chain sprockets for ANSI chains

create_flange

ASME B16.5 pipe flanges (5 types)

create_pipe

Pipe/tube sections

create_openbuilds_part

V-Slot rails, C-Beam rails, lead screws

Community

Tool

Description

search_models

Search Thingiverse for 3D models

Publishing

Tool

Description

publish_github_release

Upload STL/STEP to GitHub Releases (via gh CLI or API)

publish_thingiverse

Create a Thing and upload STL to Thingiverse

publish_myminifactory

Create object and upload STL to MyMiniFactory

publish_cults3d

Create listing on Cults3D via GraphQL API

Development

make install          # Install dependencies
make test             # Run unit tests
make test-integration # Run all tests (requires build123d)
make lint             # Check code style
make format           # Auto-format code
make verify           # Lint + test
make run              # Start the MCP server
make clean            # Remove build artifacts

Requirements

  • Python 3.11+

  • uv package manager

  • macOS (tested on Apple Silicon) or Windows 11

  • Claude Code CLI

Project Structure

src/threedp_mcp/
├── server.py       # Thin entrypoint — FastMCP init + tool registration
├── constants.py    # Material properties, ISO thread table
├── helpers.py      # Shared utilities (shape conversion, code execution, etc.)
└── tools/
    ├── core.py         # create, export, measure, analyze, list, get_code
    ├── transform.py    # transform, combine, import
    ├── modification.py # shell, split, add_text, threaded_hole
    ├── analysis.py     # estimate, overhangs, orientation, section, drawing, color_split
    ├── utility.py      # shrinkage, pack, convert
    ├── components.py   # enclosure, gear, snap_fit, hinge, dovetail, label
    ├── mechanical.py   # threads, fasteners, bearings, sprockets, flanges, pipes, openbuilds
    ├── community.py    # search_models
    └── publishing.py   # github, thingiverse, myminifactory, cults3d

Uninstall

Plugin

/plugin uninstall 3dp-mcp-server@3dp-tools

Manual Install

macOS:

claude mcp remove 3dp-mcp-server -s user
rm -rf 3dp-mcp-server

Windows:

claude mcp remove 3dp-mcp-server -s user
Remove-Item -Recurse -Force 3dp-mcp-server

License

This project is licensed under CC BY-NC-ND 4.0. You can use it personally and share it with attribution, but commercial use and redistribution of modified versions are not permitted.

Interested in collaborating or commercial licensing? Open an issue to get in touch.

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