A few hours ago, Tom’s Hardware published a detailed report and summarised some of the information. They also asked Bambu for more information. This clarifies a number of other questions.
The statement from Bambu, for those who don’t want to open the link:
Bambu Lab Responds to Allegations
We reached out to Bambu Lab for a statement on the melting A1 printers. A representative was quick to acknowledge the issue, but insisted that failure rates were extremely low (around .052%), directly connected to preventable power surges, and were fixed in Q3 of 2025 when the NTC was removed and the board redesigned. All customers who reported problems with the power board were provided with repairs or replacements.
"While a damaged NTC may generate sufficient heat to deform or melt adjacent plastic, it does not lead to ignition or sustained combustion. As a result, the risk of fire is considered extremely low.”
Bambu Lab said safety issues are taken very seriously and that an engineering team “conducted a detailed analysis of the affected units. We observed that these cases often correlate with regions and time periods experiencing severe thunderstorms, though other sources of grid surge cannot be fully excluded.”
“After reviewing field data and considering that the inrush current of the printer is relatively modest, we determined that the benefits of the NTC-based inrush protection were limited compared to the potential downsides under rare surge conditions. As a result, we implemented a design change in Q3 2025 that removes the NTC from the circuit in newer production units.”