Bambu Lab explained in the community forum on November 12, 2026, why the cloud rejected requests from third-party software earlier this week. The manufacturer puts the increase at roughly 34 times within one hour, with the peak at around 20 million requests per day. Bambu Lab writes that the cloud would have gone down within hours at this rate of increase. The manufacturer therefore temporarily blocked the conspicuous traffic after a brief review. Some users were affected until the block was adjusted. The service has since been running stably again.
Almost all of the conspicuous requests went to the interface that provides the status of print jobs. They came from connections of many private households and all identified themselves as OrcaSlicer with an older network plug-in. This identifier identifies a program to the cloud. The OrcaSlicer team pointed Bambu Lab to other programs using the same identifier, including ha-bambulab, the Home Assistant integration for Bambu printers. The developers of ha-bambulab quickly released a fix. Bambu Lab has not confirmed whether all of the traffic originated from there.
What Is Third-Party Software Still Allowed to Do in the Bambu Cloud?
Status data remains permitted: third-party software may continue to retrieve temperature, position, speed, and print progress. This monitoring does not change the operation or safety of the printer, and it remains available within reasonable usage limits. Bambu Lab does not state a specific number for this. If an overload threatens, the manufacturer reserves the right to limit requests or temporarily block access.
Third-party software in the Bambu Cloud
The rules from Bambu Lab's announcement of November 12, 2026
- Display temperature, position, and speed
- Retrieve print progress, within the usage limits
- Assign printers directly to an account
- Retrieve live video directly
- Start prints, only via Bambu Connect
- Update firmware directly
Information from Bambu Lab, the manufacturer does not state a number for the usage limits
Source: Bambu Lab Forum
The situation is different for everything that changes the printer. Account assignment, live video, print start, and firmware updates are, according to the post in the Bambu Lab Forum, not intended for direct access by third-party software. For automations that control print jobs, Bambu Lab names Bambu Connect as the officially intended route. The manufacturer does not mention a restriction to certain countries.
What Happened with ha-bambulab?
ha-bambulab has been available since November 11, 2026, in version 2.4.0. The release notes mention a critical bug: a previous version repeatedly sent requests to Bambu services, and these then blocked the integration using the protection service Cloudflare. Version 2.4.0 logs in with a new identifier so that the connection works again. The beta 2.4.1 additionally sends the version number along.
This is not new. On the wiki page on cloud incidents, Bambu Lab lists eight incidents between June 2024 and January 2025, the largest with 13 million conspicuous requests on October 21, 2024. Our assessment: a connection via the Bambu Cloud is subject to the manufacturer's rules, and a bug in one project can affect users of other programs. Because ha-bambulab used the identifier of OrcaSlicer, Bambu Lab initially considered OrcaSlicer users to be the cause.
What This Means for You
For ha-bambulab in Home Assistant, it is best to install version 2.4.0 or newer, especially if your printer data has been missing since the beginning of the week.
For other software such as monitoring programs, scripts, or plug-ins, check whether it identifies itself to the cloud with its own identifier and only retrieves status data. Switch your own scripts to their own identifier and query the status only as often as you really need it. The identifier helps Bambu Lab attribute a problem to the right project and protects uninvolved users in the event of a block.
For starting prints via a program, Bambu Lab names Bambu Connect; live video and firmware updates are not intended for third-party software. Before switching, it is best to check which of these routes your software needs.
Bambu Lab published the retrospective in the community forum on November 12, 2026.
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