Thanks for pointing in the right direction, @JonRaymond ! Our X1C wasn’t detecting any Bambu filament for months until I finally decided to dig into this. I found that the setting ‘Update on startup’ was disabled. After enabling and restarting the printer, it did a clean check of all filaments and detected all Bambu RFIDs perfectly. It was merely a minor nuisance but it’s nice to have it working again 
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I agree with you, so far the detection was working except for the last slot, I used a none Bambu filament and it was always setting it to PVA but it was a PC, I was expecting not recognised filament. To be able to enter the specs manually wich menu I did not get. If I put the PC wheel on 3rd position, I had a not recognised filament so When I pressed on the feed button I got the Menu to enter the specs of the filament. When I was using Bambu filaments, When I feed the filament the machine did not turn the spool enough so that the RFID of the spool did nor reach the sensor and therefore could not detect the filament type and color. The problem is sofware but it somehow intemitent. Because I did not have any software update and on the same day it stopped working. It couls be by entering manual date in the AMS system could affect the normal operation of the AMS. Now I am looking for a way to reset the ems setup to its factory setting.
Now I have another problem, the printer think that there is an external spool, I have none installed. There is nothing cludge. It is like if the program has gone crazy. Now I am sure that the problem is comming from the firmware.
Im also having this issue the last few weeks . Ive had my x1c and ams since its release in canada and never had this issue before . Power off my printer and it recognizes the filament . Pretty annoying that i now have to power cycle my printer for it to recogniz bambu filament . Only reason why im paying 14$ more a kg is for the reusable spools and RFID . Anyone find a permanent solution?
I’ve had these issues on and off as well. The spool recognition seems random and spotty at best. I believe a powercycle would cure it and it seems to recognize spools when I unplug it to dig out broken filaments. (Another fun task given how it’s assembled. I’m assuming future models will have a more convenient way to do apparently regular “maintenance”.)
Thanks for your response to this post mdavis1863. I keep correcting my unidentified filament (P1S) it in the prepare tab of Bambu Studio…for every job. I never thought to go to the device tab and manually set my filament. I have two AMS units and only one slot will not recognize any spool. I tried swapping around and it seems that one cannot sense the tags. It just seems simpler to just type it in and move on until I have time to dive into it endlessly.
We just starting having this issue with our 2nd AMS. It will read the far right spool only. The other three are no-go’s with Bambu filament on a Bambu spool. When I attempt to reload each slot, it will flash up with the correct filament information, then revert back to a question mark. I’ve power cycled our X1 Carbon several times, I’ve even power cycled the AMS several times independently, and still have three unrecognized slots in the AMS.
This is what worked for me. Unload all filament the. Power cycle.
Manually load a spool in the first slot selecting all the settings.
Then manually setup a spool in the external spool holder.
Then load the filament using the on screen buttons for the external spool. Mine thought there was an external spool already so I had to disconnect the tube from the ams hub and put the external filament through. I extruded a little to make sure it was using the external spool.
Then using the onscreen buttons unload the external spool. Once it asks you to pull out the external filament and successfully finish that process put back the ams hub tube. I then used the buttons to manually load the first slot we configured on the ams. I then did the unload process for that filament on screen. Then I added a spool is slot 2 and it successfully read it. I was pulling my invisible hair out. Finally it’s working
I just had this same issue. I swapped a spool and it wasn’t reading. I tried trading two spools and then both were stopped.
I tried power cycling both the PS1 and PC software multiple times.
Solution: while the P1S system is power unplug the AMS cable, wait 30sec, and plug it back in. It will basically reset the AMS and it’ll run through all the filament spools and read the RFID chips.
I’m having same issue. Not recognizing filament in AMS after “downloading orca slicer”. Everything was working fine until then.
It’s the same for me. After I downloaded the Orca Slicer yesterday, my black PETG HF is no longer recognized.
I had the same problem after drying my filaments and putting them back on a other position with the printer OFF. BS regonized the filament as on the old positions before drying. I removed all filament. Then printer off. In BS a sync done. BS sees no filament. Then with the printer ON I placed back all filament on the new positions. A sync in BS done. ALL OK.
Hi, where did you find the ‘Update on startup’ setting?
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You can do it in the handy app and in Bambu Studio, under the AMS settings:
If you do it on the printer itself it looks like this:
That’s great. thanks for the help 
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I think I may have sussed it! It’s whenever I put a reel of white in the AMS! I’m guessing that the tag may be corrupt or something! It doesn’t matter what position a place it in, it seems to screw up the detection of the other slots as well!
I’ve had rolls that it couldn’t read at all but I don’t think I’ve ever seen one that messed up the other slots. When you went to the settings was “update on startup” and “update on insertion” already checked or did you have to turn them on? If you did have to turn them on try turning the whole printer off and back on to see if that fixes anything with that spool.
Hi, yep they were already on. As soon as I removed the suspect reel and put a different on in then all was OK straight away. When I get time I will try the white again as see if it screws it up again! When they white reel was it it was saying that I has black TPU in slot 4!! I don’t even have any TPU!! Very strange!!
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where is that setting ? can you guide
Hello. In Bambu Studio there is a gear icon near the bottom right of the device tab
On the printer its the second icon from the top on the left menu.
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Have to say the AMS is unreliable from my experience.
Printer is little over a month old and I have to juggle the filaments to get them to detect.
It lights up (white light on) when inserting a roll but 1/2 the time it won’t do the roll spin and detect the filament.
It does pull the filament down and through but doesn’t do any roll handshake.
Some slots work less than 10% of the time and others half the time.
I can remove a roll put it straight back and it goes from detecting to ?
Kills my humidity level because I end up playing roll simulator for a damn hour!
Very much regretting the purchase.
Additional information:
I’m confident I’ve found at least where the problem originates. I’m new to Bambu printers so I apologise if this isn’t correct.
Back to the previous troubleshooting that I walked away from.
When again trying to get the filament to detect I attempted to remove the last roll which I noticed was still loaded, therefore preventing the filament removal.
I checked the PC and mobile, both claimed as before that no filament was loaded.
I selected unload (twice) from Studio and once it unloaded the second and only other filament immediately ran through its detection and worked.
I populated the other 2 slots and zero issues, detection worked.
I never manually load filament, let the system auto manage it. I just tried to do a print and with that swap out the rolls.
I assume the AMS can’t handle adding a filament when it’s loaded, I’m just not sure why it didn’t auto unload.
If anyone is having issues check your filament for one that’s loaded.
Either check the PTFE or try to release all the rolls until one will not and then unload it.
Hopefully this helps others.