printd
Enables MCP clients to submit, slice, and start 3D prints with configurable gates, preview approval, and monitoring, via a self-hosted print daemon.
README
<p align="center"><img src="assets/logo.svg" width="140" alt="printd"></p>
printd
A self-hosted print daemon. Send it a model, it slices with your profiles, enforces your rules, shows you a preview, prints on your go, and watches the print with snapshot notifications. Drive it from any MCP client (Claude, agents, your own tools) or the bundled CLI.
Why
Printing through a chat agent usually means a long chain of manual steps executed differently every time. printd makes the pipeline deterministic: the agent makes decisions, the daemon does the work, and a print is three calls: submit, slice, start.
How it works
submit (file or model URL)
-> slice (your slicer, your profiles)
-> gates (your rules: no brim, placement, bounds, ...)
-> preview image -> human approval (overridable)
-> start (preheat, print)
-> watcher (snapshots, milestones, stall detection, notifications)
The engine ships empty
Everything opinionated is a swappable part configured in one YAML file:
| Seam | Ships with |
|---|---|
| Printer drivers | OctoPrint |
| Slicer adapters | OrcaSlicer CLI |
| Gates | brim/skirt policy, placement zone, bounds check, preview approval |
| G-code transforms | fresh-mesh probe preamble, Marlin start-gcode patches |
| Notifiers | Home Assistant |
If a behavior can't be expressed as config on one of these seams, it doesn't belong in core.
Quickstart
pip install printd
printd-server --config config.yaml # MCP server (HTTP) + watcher
printctl status # same operations from the shell
See example-config.yaml for a full config.
License
MIT
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