kiln3d 0.4.2

MCP server + CLI that gives AI agents safe access to 3D printers (OctoPrint, Moonraker, Bambu Lab, Prusa Link, Elegoo) — 430 tools for AI-driven print workflows

Kiln

Agentic infrastructure for physical fabrication. Kiln enables AI agents to design, slice, queue, monitor, and fulfill 3D print jobs through a unified MCP (Model Context Protocol) server and CLI.

What Kiln Does

An agent can go from intent to physical object with zero human intervention:

Agent: "Print this sensor mount"
  → Kiln validates the file
  → Checks printer readiness
  → Uploads G-code
  → Starts print
  → Monitors progress
  → Reports completion

Quick Start

1. Install

# From PyPI
pip install kiln3d

# From source (development)
pip install -e ".[dev]"

2. Configure

# Option A: Environment variables
export KILN_PRINTER_TYPE=octoprint
export KILN_PRINTER_HOST=http://octopi.local
export KILN_PRINTER_API_KEY=your_api_key

# Option B: CLI auth (saves to ~/.kiln/config.yaml)
kiln auth --name my-printer --host http://octopi.local --type octoprint --api-key YOUR_KEY

3. Run

# CLI
kiln status
kiln print model.gcode

# MCP Server
kiln serve

4. Connect from Claude Desktop

Add to ~/.config/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "kiln": {
      "command": "kiln",
      "args": ["serve"],
      "env": {
        "KILN_PRINTER_TYPE": "octoprint",
        "KILN_PRINTER_HOST": "http://octopi.local",
        "KILN_PRINTER_API_KEY": "your_api_key"
      }
    }
  }
}

Supported Printers

Backend	Status	Printers
OctoPrint	Stable	Any OctoPrint-connected printer (Prusa, Ender, custom)
Moonraker	Stable	Klipper-based printers (Voron, Ratrig, etc.)
Bambu Lab	Stable	X1C, P1S, A1 (via LAN MQTT + FTPS)
Prusa Link	Stable	MK4, XL, Mini+ (local REST API — type: prusaconnect)

Features

• 430 MCP tools for full printer control, fleet management, slicing, model generation, marketplace publishing, and fulfillment
• 116 CLI commands with --json output for agent consumption
• Multi-printer fleet management with job queue and background scheduler
• Model marketplaces — search/download from MyMiniFactory, Cults3D (Thingiverse deprecated — acquired by MMF, Feb 2026)
• Slicer integration — PrusaSlicer and OrcaSlicer with auto-detection
• Text-to-model generation — Meshy AI, Tripo3D, Stability AI, OpenSCAD with auto-discovery registry
• Printability analysis — overhang detection, thin wall analysis, auto-orientation, support estimation, failure prediction, quality scorecard
• Mesh operations — mirror, hollow, center, scale-to-fit, merge, split, simplify, repair, non-manifold analysis — all pure Python, no external mesh libraries
• Print DNA — model fingerprinting, crowd-sourced print settings, intelligent settings prediction
• Marketplace publish — one-click publish to Thingiverse/MyMiniFactory with print "birth certificate"
• Revenue tracking — per-model creator analytics, 2.5% platform fee on Kiln-published models
• Print-as-a-Service — local vs fulfillment cost comparison, order lifecycle management
• Failure recovery — 9 failure types classified, automated recovery planning
• Multi-printer splitting — round-robin and assembly-based job distribution across fleets
• Generation feedback loop — failed print → improved prompt with printability constraints
• Smart material routing — intent-based material recommendations (8 materials, printer capability aware)
• Community print registry — opt-in crowd-sourced settings ("Waze for 3D printing")
• Fulfillment services — outsource to Craftcloud (150+ print services, no API key required)
• Safety first — pre-flight checks, G-code validation, temperature limits, optional auth
• Webhooks — HMAC-signed event notifications for job lifecycle
• OTA firmware updates — check, update, and rollback printer firmware

Architecture

AI Agent (Claude, GPT, custom)
    |
    | CLI or MCP (Model Context Protocol)
    v
+--------------------+
|        Kiln        |
+--------------------+
  |       |        |        |
  v       v        v        v
OctoPrint Moonraker Bambu  PrusaConnect
  |       |        |        |
  v       v        v        v
Prusa   Voron    X1C/P1S  MK4/XL

Development

pip install -e ".[dev]"
cd kiln && python -m pytest tests/ -v  # 8,000+ tests

License

MIT