TIP: For Orcaslicer users who are having trouble syncing the filaments from Orcaslicer to the AMS.
Make sure you check your Orcaslicer preferences (Ctrl+P) especially the Network part.
Make sure Stealth Mode is not selected. (hover with mouse over the checkbox to see why 
)
My custom filaments were not syncing to my AMS and then i stumbled upon this feature.
I also had to rebind my account to the printer.
I have read through this thread with interest. Because I have spent literary hours trying to get the AMS to accept a custom Filament. I had the same symptoms as described about. The AMS would accept the filament, then a few seconds later revert to ā?ā. In my case I found out that I had both a laptop and PC running OrcaSlicer. When I shut down the laptop. The AMS accepted the Custom filament. So it appears that the cloud sync does not work properly when two or more PCās simultaneously run on the same printer.
Thanks man, finally understood how this works, bambu wiki didnāt help on this!
Yea! The Logoff/Login trick works!
Latest OrcaSlicer - 2.2 (beta) and X1C Firmware (1.08.02)
EASY WAY - LOG OFF ON PRINTER AND USE BAMBU HANDY ON PHONE OR TABLE TO LOGIN!
It reads the QR code on the printer and logs in using that. Took like 10 seconds. My custom filament showed up as soon as I loaded a reel.
Hi Guys just had the same issue started making custom filaments and for the life of me could not get them to stick on the printer the ? of agony kept popping up. Tried all sorts and the below fixed it for me. I run 10 printers so I have orca and bambu studio opened at the same time for different projects. Once i shut down both orca and bambu studio and left them closed. Then I went to the X1c Screen, proceeded to choose the filament (click little pencil) on the right hand side you will see a refresh icon click that, choose the brand , type and color and it finally stuck.
Thanks pavlo, this was driving me insane and your solution worked 
Hi there!
I see the notifications for this pop up in my email and they are usually āit didnāt workā or āit worked onceā and Iām kinda sorry I ever posted. I thought this was a good fix, but in reality itās definitely hit and miss, and so Iām sorry if you read this and it didnāt work for you.
However, my overall experience is that it generally works, and I add my filaments, and just make my stuff and most of the time the new options just appear.
So Iām happy to hear it does work for some, and Iām sorry if it doesnāt.
Happy printing whatever you do!
Logging out on the printer and rebinding using the Handy app fixed it for me. The custom filament didnāt sync even after doing the Flow Dynamics calibration (before I tried the log out and rebind).
Also looks like the log out and rebind needs to be done every time you create a new custom filament.
Just got my X1C 3 days ago and been playing with it. I had some filament from my old printer that had a unique need for nozzle temp (itās PLA but needs a nozzle temp of 220 C) so was trying to create a custom profile for it and it wouldnāt show up in the AMS selection until I did the log off and rebind.
That worked for me as well.
I tried getting my custom filaments done on the P1S now that the new firmware and new Studio version claim it works as advertised.
Well, it does notā¦
Yes, you can now create custom filaments and add them where needed with relative ease.
But the AMS sync and re-sync is still more of a miss than a hit.
I am Lan only here, no cloud use.
Making something a little bit better while adding a bitter taste is a bit like vegan sausages.
Why call it sausage if it defies the very definition of itā¦
Being unable to make any of this work without the hassles of logging out of the account I donāt actually use in Lan only mode and messing with the phone app I had to install despite having no use for itā¦
Letās just say updates and the implementation of them could and should be better than this bogus security we donāt actually need.
If it shows just one thing than that we donāt actually own our printers.
Nothing works unless machine, software, firmware AND account are āsyncedā the Bambu way, which they often fail to disclose on time.
Months later, still the same issuesā¦
Now imagine Bambu kills your account and also bans your printer.
I KNOW, they would never do thatā¦ (Are you sure though)?
Good luck printing if all you are left with is juggling the SD cardā¦
Or letās say Bambu needs an incentive to make you buy their next generation printer.
All it takes is a firmware update to make you help decide, preferable one from which you canāt downgradeā¦
Or the new Studio versions no longer getting including the full support for your old printerā¦
Apple did this quite often, still does, same for Microsoft, car and appliance makers,ā¦
Make the next generation a bit better then wreck the previous one, even if you do it the hard (for the consumer) wayā¦
Bambu is still to be considered a start up, an emerging company with great ambitions.
We see constant improvements all the time, we see that Bambu, for a lot of things still listens to their customersā¦
Not all is bad and there is plenty of room for improvement.
Just never forget that business thrives on profits not on printers living forever
i have tried this on my A1 with AMS but i can seem to get it to work. the buttone on the calabration page are greyed out
Iāve owned this for two years but am only recently really getting into it. All thanks to my 4 year old nephew asking Santa for an action figure that didnāt existā¦
Iām going through and am glad yāall had all 2024 to figure this out before I noticed it was an issue for me. I am having to create profiles identical to the system presets, but with the Aux Fan turned off. It has ruined too many prints for me. I have printed so infrequently I always forget itās a problem until I need to print something that gets close to the Aux Fan.
Donāt be, this is very useful! I think if you edit your original post to include the suggestion of rebinding to the printer then it should be reasonably reliable.
That hasnāt been my experience. I add custom filaments all the time and they appear right away. Once in a blue moon I have to log out and back in, and Iām not sure what drives the need for that, but I know itās not just the creation of 1 more new filament.
In the 2 years Iāve been printing, iāve only had to re-login maybe 2 or 3 times?..
When the a1 first came out we had the ability to add customs filaments in batches. It work well, about Q2 of the following year, BL stripped that from us and still havenāt gotten it back. Adding filament is cumbersome, blocky, and capped at a certain amount (very low count when you decide to have a profile for every mfr, material, finish, and color) You can easily hit 100 and they BL says you cannot add anymore. You also canāt batch edit filaments either, example, if you decide to not want the aux fan on because PLA does not like to have air blown on it shortly after being extruded, you have to go in one by one and place a 0 in the % box at the bottom of the filament setting window.