We have recently received several reports of printers experiencing black screen / restarts during printing. After thorough analysis, we have identified that the issue stems from a recent auto-update to our cloud service’s certificate, which leads to possible printer reboots.
A certificate is a security measure that allows for encrypted SSL communication between the Cloud Servers and the 3D Printer. Similar certificates are used for websites, to provide a secure encrypted connection between the Computer and the Website Server.
Our cloud service adheres to a security policy of automatically updating certificates every three months. This is a standard practice to ensure high security.
According to this policy, the certificate was updated on June 24th, 07:36 UTC.
At this time, some users began reporting issues shortly after this update for printers from the P1 and A1 Series.
Due to a small bug in the firmware of the P1 and A1 series, the certificate verification process on the printer side did not work as expected which caused the firmware to crash during use and reboot the printer.
The X1 Series remains unaffected, as it uses a different firmware base and does not suffer from this bug.
As a quick solution: The certificate known to cause issues has been replaced with an updated certificate with a different algorythm, from a different Certification Authority. As of June 27th, 06:00 UTC, our cloud service now runs on the new certificate.
As a longer-term fundamental solution: We are in the process of optimizing the certificate processing method for the P1 and A1 Series in the firmware, to avoid similar issues in the future. The updated firmware addressing this issue is currently undergoing internal testing, and will be released to the public following thorough quality evaluation.
No other action is required from users to solve the issue, as this has been a server side change. The printer can be used with confidence again.
We apologize for any inconvenience this may have caused and appreciate your patience as we work to completely resolve this matter promptly.
Should you have any further questions or concerns, please do not hesitate to contact our customer support team.
Thank you for your understanding.
Bambu Lab