We want to inform our readers and 3D printing community about a recent safety concern reported for the Bambu Lab A1 3D printer, specifically affecting some older units.
What Happened
Multiple reports from owners and independent sources, including Reddit discussions and media outlets like All3DP, videos on Youtube have shown that certain older Bambu Lab A1 printers can experience overheating and melting of internal components, particularly the NTC thermistor on the AC power distribution board.
While no confirmed fires have been reported, users have noticed:
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Burnt or melted plastic near the AC board
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Strong burnt-plastic smells during operation
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Frozen prints or sudden printer shutdowns
These incidents appear to be rare and affect older machines produced before design revisions.
Source: Reddit
Source: Reddit
Source: Reddit
Bambu Lab Response
Bambu Lab has acknowledged the reports and stated:
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The risk exists but is rare and uncommon.
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Newer A1 units have a redesigned AC board, which eliminates the problematic component.
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Affected units are eligible for replacement or repair through official support channels.
For more information, Bambu Lab recommends contacting their support team if you own an affected printer.
Safety Recommendations
To minimize risk:
- Install Smoke & Fire Detection
Our smart smoke detector is designed to automatically cut power when smoke is detected
The custom enclosure with automatic fire suppression units
- Inspect your printer regularly, especially older models, for signs of melted or damaged components.
- Contact Bambu Lab support if you notice overheating or burnt components.
- Update your firmware and check for AC board revision eligibility if applicable.
Community Feedback
Reddit threads and independent reviews have highlighted the experiences of several owners who reported overheating and component burnout. While these cases are relatively rare, they emphasize the importance of printer safety and vigilance.
For further reading:
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https://all3dp.com/4/bambu-lab-confirms-a1-components-on-older-machines-can-burn-out/
- https://www.reddit.com/r/BambuLab/comments/1q77say/bambulab_says_a1s_are_safe/
