Bambu Lab AMS Error Code 0300_1000: How to Fix It

Q: What does Bambu Lab AMS error code 0300_1000 mean?

Error code 0300_1000 means the humidity sensor inside your Bambu Lab AMS unit is reporting an abnormal or out-of-range value, or has lost communication with the AMS controller. The sensor monitors moisture in the filament storage area, and this error prevents the AMS from operating normally until it is resolved.

Q: Can I still print with error 0300_1000 active?

In many cases the printer may still allow printing while this error is displayed, but the AMS humidity monitoring function will be unavailable. This means you won't get alerts if moisture levels rise and damage your filament. It is best to resolve the error before running long print jobs to protect both your filament and print quality.

Q: Will a firmware update fix Bambu Lab error 0300_1000?

Sometimes, yes. Firmware bugs can cause false sensor errors, and Bambu Lab regularly releases updates that address such issues. Always check for and install the latest firmware on both the printer and AMS as a first troubleshooting step before opening any hardware.

Q: How do I prevent AMS humidity sensor errors in the future?

Keep the AMS in a clean, climate-controlled environment with relative humidity between 40–60%. Periodically use compressed air to clean the interior of the AMS, avoiding filament dust buildup near the sensor. Store filament properly with desiccant packs when not in use, and keep the AMS cover closed during and after printing.

Q: Is Bambu Lab AMS error 0300_1000 covered under warranty?

If your Bambu Lab printer and AMS are within the manufacturer's warranty period and the humidity sensor has failed under normal use conditions, the repair or replacement is likely covered. Contact Bambu Lab support with your serial numbers and a description of the issue to initiate a warranty claim.

Abstract

Bambu Lab AMS error code 0300_1000 indicates that the humidity sensor inside your Automatic Material System (AMS) is reporting an abnormal reading or has stopped communicating correctly. This sensor monitors moisture levels to protect your filament from humidity damage, so when it malfunctions, the AMS cannot reliably track filament storage conditions. In most cases this error is caused by a faulty or disconnected sensor, accumulated dust or debris, or a firmware glitch — and it can often be resolved without replacing any hardware.