I said AMS but I meant the buffer unit.
Add me to the list, I was having this issue, and tore the hotend/extruder apart, and it turned out it was just the buffer spring had moved out of its base and was limiting its range. Anyone have a new design for the plastic buffer that has a better spring base?
I wonder if the above people that fixed their printer due to messing with the magnet, was really them just inadvertently fixing the spring in the process of taking it apart and putting it back together.
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Having the same issue in 2025. Just took apart the buffer and flipped the magnetā¦ had no idea which way to flip it, but sounds fun. Also noticed I needed firmware update before I flipped the magnet so I tried that to no avail. After flipping the magnet and before trying again; I noticed I must be way behind on firmware because I need another firmware update including one for the AMS. This started happening to me after some prefect prints with MatterHackers Pro PLA filament, so I thought it was to blame. In fact, I thought the dual color mixed filament type was to blame although all prints have come out fine until the 'clogged message started happening. Replaced hotend with full assembly brand new hardened steel one. Replaced the filament cutter assembly, lever , and blade. Just tried and same issue. Only thing I can think to do is wait on my replacement filament sensor and pop that in.
I am here with you. Mine is failing whether I am through the AMS or external, no splitter involved. Iāve swapped hot ends, disassembled and cleaned the extruder - with no issues noted, replaced the tubing in the machine (the only piece common to using with or without the AMS) and have a new extruder on the way. Unfortunately Iām afraid this isnāt going to fix my problem. Iāve done several cold pulls, with white filament coming out clean as a whistle now, and it feeds directly though the top for a cold pull without any issues.
The machine has 1156 hours on it, and Iām at a loss.
This Is also happening to me. Printer was working perfectly for ages now for some reason in filament slot 1 it gives this error saying nozzle is clogged (which it isnāt) sometimes I press retry and it works. Any Suggestion?
How far does the filament travel before the message appears? You can see in the PTFE tube where it stops. Does it really reach the extruder?
Dude after 4 hours of trouble shooting this after i got home from work to my new AMS. This was my solution. Thank you so so much!!!
Thank you for this! This solved my problem immediately, I had a filament break in the buffer a few days ago and routed the outgoing tube exactly as you described, a day or two later the problem started. I stripped the extruder down cleaned everything and re-greased the gears, I was about to start thinking about replacing the extruder till I saw your post and gave it a try and problem solved!
For me, this started to happen after I changed the filament entrance, there is a magnetic there, you need to make sure to put back exactly how it was, it can take up to 4 tries. Make sure you change that and try if you did some work there.
I have had the same issue with a BambuLab P1S + AMS 2 Pro, new and out-of-the-box. Probably about 50% or more of my color changes fail to extrude regardless of nozzle temperature, PTFE tubes, etc. In fact, I can manually extrude the filament without issue by hand feeding and then controlling the extruder on-screen. If I wait a few minutes and tell the printer that the issue was resolved (without changing a thing) and it will work again, so itās clearly not a clog.
My issue was completely resolved by opening up the filament buffer, completely disassembling it, and then reassembling it with no change whatsoever. I did NOT flip the magnet, I did NOT replace any parts, simply took it all down to individual pieces and then screwed it all back together.
My best guess is that something in the filament buffer is wrong from the factory, and a complete tear-down + rebuild somehow resolves this, but who knows. I have 2 other machines (also brand new) that I will test this fix on and report back.
I literally just received my AMS Pro 2 today (I got my X1C yesterday). I am having the same issue everyone has been reporting. I did tear down the hub as suggested by @Brain_Vision_LLC , but did nothing. I will try to invert the magnet now and will report back.
Canāt believe it is being shipped like this
New X1C owner here, I have been fighting this for a week now. I have had a P1S for awhle now and other than card board spools never had an issue. Loaded up some elegoo plastic rolls and sunlu as well. Kept getting this issue. Put them in my P1S no issues. After checking for clogs, disassembled the hot, end ran all new PTFE tubing. Found this thread and tried everything no luck. I tossed in a bambu spool randomly no issues. loaded both AMS with bambu spools no issues.
All I can assume is the X1C is more sensitve to seeing things perfectly vs the P1S just does itās thing. Needless to say I have both printers cranking out spools.