Bambu Lab HMS_0701-0401-0001-000B Error: AMS Does Not Update Filament
When your Bambu Lab printer displays the code HMS_0701-0401-0001-000B, it is reporting a specific failure in the Automatic Material System (AMS). This error indicates that, at the end of a print job, the RFID reader head could not communicate the new consumption data to the smart tag on the spool. Although the printing process ends normally, the system internally logs this failure, which can cause subsequent issues. 🧐
What Does This Failure Mean for Your Next Prints?
The core issue does not interrupt the current job, but it has consequences for the future. The AMS manages the filament inventory based on the information it reads from the RFID tags. If it cannot write to them, it retains old data in its memory about the amount of material. The next time you use that same spool, the system will show an incorrect remaining weight, which could trigger false insufficient material warnings and complicate planning your projects.
Immediate Steps to Diagnose and Resolve:- Inspect the Spool and Its Position: Ensure the spool is properly seated in the AMS compartment. Check that the RFID tag is not physically damaged, covered by dust, grease, or an adhesive that blocks the signal.
- Restart the AMS System: A physical restart can clear erroneous states. Disconnect the power cable on the back of the AMS unit for 30 seconds and then reconnect it.
- Maintain the Reader Hardware: If the error persists, turn off the system and carefully clean the RFID reader contacts inside the AMS using compressed air to remove interfering particles.
Technology promises to manage our filament automatically, but sometimes we must manually note what the chip forgot to write.
Manually Manage Filament Inventory
When the hardware solution is not enough, you can take control of the data to prevent the system from mismanaging the material. The most direct way is to manually update the weight in the software interface.
How to Prevent Incorrect Readings After the Error:- Weigh and Note Manually: Use an external scale to weigh the spool that caused the error. Enter that value manually in Bambu Studio or on the printer's screen to overwrite the incorrect information stored by the AMS.
- Set Up the Workflow: This method prevents alerts based on erroneous data and allows you to continue using the spool in the AMS with accurate information.
- Use the External Filament Port: If the error is recurrent with a specific spool, a stable solution is to feed the printer directly from that spool using the external port, thus completely bypassing the AMS system for that material.
Conclusion and Proactive Management
The HMS_0701-0401-0001-000B error is more of a management nuisance than a critical failure. Understanding that the problem lies in writing data to the RFID tag allows you to act effectively. Combining physical hardware verification with manual inventory updates in the software gives you total control. Thus, even if automatic communication fails, you can ensure your Bambu Lab printer always has correct information about the available filament to continue producing without unwanted pauses. 🛠️