Send print control commands and read telemetry from a Bambu Lab printer via local MQTT
domain: github.com/Doridian/OpenBambuAPI · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
On current firmware (since Bambu Lab's January 2025 Authorization Control update), first enable Developer Mode on the printer (LAN Mode settings) — local MQTT is no longer open by default, and enabling it disconnects the printer from Bambu Cloud/Handy
Connect over TLS to mqtt://{PRINTER_IP}:8883 using username bblp and the printer's LAN access code as the password.
Subscribe to device/{DEVICE_ID}/report for status and command responses, and publish to device/{DEVICE_ID}/request to send commands.
Publish a print.pause, print.resume, or print.stop command (JSON payload under the "print" key with an incrementing sequence_id) to control the active job.
Publish a pushing.pushall command to request the full current status object when a complete snapshot is needed.
Known gotchas
This is an unofficial, reverse-engineered protocol documented by community projects (e.g. Doridian/OpenBambuAPI) — Bambu Lab does not publish or officially support it, and it can change without notice across firmware updates.
P1-series printers only report changed fields on push_status (unlike X1, which always sends the full object), and pushing.pushall should not be called more often than roughly every 5 minutes on a P1P due to hardware limitations.
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