Describe it or draw it.
Kiln makes it real.
Kiln 3D lets AI agents safely control 3D printers
The intelligence layer between your idea and a physical object.
Get started
$ pip install kiln3d Then connect your printer and create objects with AI.
What is Kiln 3D?
Kiln 3D is open-source infrastructure that lets AI agents design new objects, discover existing models, and autonomously slice, print, and monitor jobs — recovering from failures with safety guardrails built in.
Explore Kiln by topic
Everything you need for setup, integrations, operations, and production workflows.
Install and setup
Quick install, first printer connection, and MCP server setup.
Printer and ecosystem integrations
OctoPrint, Moonraker, Bambu Lab, Prusa Link, Elegoo, marketplaces, and fulfillment.
Use cases
Print farm automation, AI prototyping, outsourced production, and lab operations.
Documentation
CLI, MCP tools, safety architecture, and full configuration reference.
Releases and updates
Feature launches, integration announcements, and real-world print stories.
FAQ
Answers on pricing, compatibility, deployment, safety, and operations.
How Kiln works
From your idea to a physical object — with intelligence at every step.
Design Intelligence
52 materials with mechanical properties, 20 proven design patterns (snap-fits, living hinges, threads), 70 parametric templates, and structural load estimation. Kiln understands what makes a good print before generating anything.
Text & Sketch to 3D
Describe what you want or sketch it. Kiln generates printable models via Gemini Deep Think, Meshy, Tripo3D, Stability AI, or parametric OpenSCAD with a 14-component catalog. Design DNA preserves the source for iteration.
Printability Engine
Every model is analyzed across 7 dimensions: overhangs, thin walls, bridging, bed adhesion, support volume, warping risk, and thermal stress. Auto-orientation and adhesion recommendations included.
Multi-Part Assembly
Design assemblies with up to 10 parts (unlimited with Pro). Clearance validation, joint type detection (snap-fit, press-fit, threaded), tolerance stacking, and automatic split planning for oversize models.
Smart Cost Estimation
Know what a print will cost before it starts — material, electricity, time. Get recommendations for cheaper filament alternatives, faster speed profiles, and quality tradeoffs.
Print → Monitor → Recover
Full lifecycle: slice, validate safety, upload, print, monitor with camera vision, detect failures, diagnose root cause, auto-fix slicer settings, and retry. One conversation, start to finish.
Safety at Every Step
29 per-printer safety profiles with temperature and speed limits. G-code validation before every send. Preflight checks, emergency stop, heater watchdog. Agents can’t bypass safety.
Fleet & Fulfillment
Multi-printer fleet with job routing, scheduling, and failure rerouting. No local printer? Outsource to Craftcloud’s 150+ third-party services. Same tools, same safety.
456+ Tools, One Protocol
456+ MCP tools and 136 CLI commands with --json output. Any MCP-compatible agent (Claude, GPT, custom) gets full access. Open source, MIT licensed, plugin-extensible.
Works with your printer
Native adapters for 5 printer backends. Same commands work across all of them.
How it works
Install Kiln, connect your printer, and let your AI agent handle the rest.
Install & discover
One command installs Kiln. kiln setup auto-discovers printers on your LAN (Ethernet or Wi-Fi), or you can register directly by IP.
Agent reads the skill
Your AI agent reads SKILL.md — a structured document defining every command, safety level, and workflow pattern.
Safely operate hardware
The agent slices, uploads, prints, and monitors — with Kiln enforcing temperature limits, G-code validation, and pre-flight checks at every step.
Human stays in control
Irreversible actions (start print, cancel, raw G-code) require human confirmation. The agent asks, the human approves.
Supported printers
Works with the most popular 3D printer ecosystems out of the box.
How Kiln compares
Kiln is purpose-built for AI agents. Existing tools weren't.
| Feature | Kiln | OctoPrint | Cura | Prusa Connect |
|---|---|---|---|---|
| Agent / AI Support | ✓ | — | — | — |
| Multi-Printer Fleet | ✓ | ½ | — | ✓ |
| Unified API | ✓ | — | — | — |
| Safety Validation | ✓ | — | — | ½ |
| Integrated Slicing | ✓ | — | ✓ | ½ |
| Search 3rd-Party Marketplaces | ✓ | — | ½ | — |
| Route to Fulfillment Providers | ✓ | — | ½ | — |
| REST API | ✓ | ✓ | — | ✓ |
Real prints. Real agents.
Two users. Two printers. Zero manual steps.
"Yo actually can you print me another coaster"
Agent sent the gcode, started the job, monitored it, and pinged Chris when done — all done. 100% complete.
Asked his agent to print. Got live webcam updates with progress every 30 minutes.
Print completed. Dillon walked over, popped the coaster off, and cracked open a sparkling water.
Different agents. Different printer brands. Same Kiln. Read the full story →
Built for agents, works for humans
Every command returns structured JSON. Agents parse it, humans read it.
Let's build.
Open source, MIT licensed, free for local printing forever.
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