I had this issue some time ago. I replaced all of PTFE tubes (inside AMS, outside and inside a printer) and problem gone. Try this.
1 Like
This is driving me nuts. You would think something this expensive would last longer than 10 months.
I’ve been wrestling with this problem for just over 1 month now. Every time I fix it, it comes back.
I replaced all the ptfe tubes. That fixed it for a week or 2.
I replaced the internal hub as one of the little connectors broke (why cant I just buy a connector?). Replacing that costs over $100 and it only worked for a week or 2 as well, now I’m back to wrestling with it again.
I work 12hr shifts so I don’t have the time for dismantling it when I need it printing right before xmas.
The filament jams up in that little hub that I just replaced. Anyone have any thoughts?
I’m considering just going back to Creality but investing about $2.5k into this printer has me wanting to at least break even on it.
A new update.
When it jams I can remove the tube from the buffer (AMS side) and easily pull the filament through the buffer with almost 0 resistance, then I “unload” that colour and it spools it back into the AMS with no issues.
But this will still not do it automatically after a print finishes.
This is still jamming and showing this error and can’t pull the filament through. If I disconnect the tube from the buffer on the AMS side and then click issue resolved it pulls it through fine. Then I have to quickly push the tube back into the buffer before it spools the next colour.
Hey @DethBringa
I’m also experiencing this issue since some weeks. Never had a problem with this before - everything was working smoothley since I bought the AMS in April 2024.
The interesting thing is, that I never could verify the allegedly broken filament. Everytime the error message popped up, I was using the left AMS slot and the filament was tangling around the spool. Filament was eSUN PETG+HS black with a cardboard spool. Some incident or parameters obviously went out of range so the software decided to spool the filament back - I guess with the purpose of refeeding it to the nozzle.
So in my case there are two issues:
- failed to pull back filament error
- filament tangled around spool
So which parameters have changed in the recent weeks? The most obvious is the temperature in my workshop which dropped to a decent 6° Celsius.
Since we’re talking about plastic which is widely known to be very temperature sensitive regarding brittleness and elasticity, a too cold filament could be the reason why the filament is stiffer which causes more friction and resistance in the PTFE tubes.
So at the moment I’m covering the printer with the AMS on top with a blanket and preheating the whole unit for at least two hours (bed in top position @90°C and AUX Fan blowing, opening the door slightly).
Notice that there are up to four full spools of filament inside the AMS, which alone are about five kilogram of material (including the spools) that has to be heated up at least five to ten degrees only by air convection (warm air rising from the printer and circulating around the AMS). So this will take some time.
The PTFE tubes from the AMS into the buffer and into the printer are also covered under the blanket.
What was causing my second issue, the tangled filament, I’m still wondering. Perhaps also some friction issue due to cool temperatures (rubber shaft from the feeder was dirty due to cardboard spools, cleaned it with alcohol).
I have not proofen yet if those measures are working.
I ordered a python upgrade for my AMS but in the meantime I was trying different things.
I printed Perfect Fit Bambu Lab/Bambulab AMS Feeder Button Cover Protector Saver (Hydra AMS compatible!) by eds_3d_shop | Download free STL model | Printables.com and put that on each feeder and no have no issues. Except 1 of these keeps popping off all the time.
Tested yesterday, no temperature issue.
In fact, it was a lot easier. My cardboard spool was damaged at the circumference, so there was a noticable resistance when turning manually.
Number 1 on the troubleshooting site: HMS_0700-0100-0002-0002: The AMS assist motor is overloaded,The filament may be tangled or stuck. | Bambu Lab Wiki
Just happened to me using some generic marble PLA. I could see the a spool of filament around the tip of the nozzle. I tried to move the bed down because it was a pretty flat print i was doing, only a few layers. I wanted to cut the tip of filament on the outsize of the nozzle I saw and I also tried using the filament cutter just pushing it in by hand. Then I tried to heat the nozzle by 10 more degrees. But it seemed the printer auto tried again before I was able to do anything and it cleared itself up automatically. I heard it retract and the next plate with a different color is printing normally. Im using an X1C.
I didn’t see anyone mention actual error codes. Maybe the X1 series doesn’t bother with codes like the P1 series does, and it just says what the issue is? I’ve had my P1 w/ AMS for a year but still feel pretty inexperienced with it. My current error code is 07ff-2000-0002-0004. I’ve completely disassembled the AMS as well as the internal hub unit, but nothing is stuck in there. I did clean out the tiny bit of dust in the hub, but till the code remains.
I had a similar issue some months back (I don’t remember the code), and I solved it by pushing out some PLA filament that was stuck in the hub. But this time, I can’t seem to find the cause. At this point I’m ready to give up on the AMS altogether since all my headaches seem to be with it.
That error code indicates that the issue is at the tool head (extruder) and not the AMS.
Oh, thanks! I kept finding posts from people with that error code saying they had to take out pieces of filament from their AMS.
Since this thread still looks active, I thought I’d post my problem to see if anyone had thoughts. I bought a second AMS for my P1P in April 2024. I mostly used slots 1 and 2 without any noticeable problems. When I went to use slot 3 I had a pullback error. The hub motor couldn’t pull the filament back from the extruder even though it was cut properly. I was able to disconnect the PTFE at the hub/extruder connector and manually push the filament toward the AMS until it finally retracted. I just recently used slot 4 and had the same problem.
I can hear the motor struggling but the filament is not stuck since manually pushing it from the extruder end allows the filament to retract. I’m thinking the internal hub motor is weak, BUT it works properly on slots 1 and 2, just not 3 and 4, even though all slots use the same motor to retract the filament. Thoughts anyone?
TIA Madmax
I’d pop the two screws out of the AMS and have a look inside.
Perhaps the two PTFE tubes from the internal hub to slots 3 and 4 are kinked or pinched or something.
Thanks for the suggestion. I did that and couldn’t see anything obvious. That AMS probably only has 20 hours on it with slots 3 and 4 hardly used at all. I replaced the PTFE tubes from the hub to the connector and from the connector to the extruder and could not get it to fail in my load/unload tests. It seems to be working for now, but still doesn’t explain why slots 1 and 2 always worked. I’ll keep using those slots and see what happens.
I’m using X1C and have also just started seeing this issue, where the print completes then the AMS is unable to retract the filament. Using the same roll of filament, I’ve tried a print from all 4 slots on the AMS. For me, only slot 3 gives the pull back error.
After receiving the error, I can press “Retry” but it always fails. However, if I cancel the print, I can tell the AMS to “Unload” the filament which works every time - so I’m fairly confident I have no stuck filament or kinked tubes.
I’ve no idea what else to try.
I don’t have the experience to tell you what your issue is, but have noticed a common issue that others have with slot three. Maybe you can search for “AMS slot 3” and check there? There is a fix for that problem where you change the bend of the PTFE tube going to slot 3 on the AMS.
Maybe it can solve our problem?
This is one of the fixes for the issue I was thinking of:
Happened to me with slot #3. My solution at the time was just to replace the [AMS Feeder Unit] (AMS Feeder Unit (Hall)) ($35.00) and problem was solved. I was tired of the “troubleshooting” provided by BL after 3 weeks.
Thanks guys, I might try swapping the feeder units around first to see if it’s the feeder. $35 is a pretty cheap fix considering the time it’ll take to troubleshoot. I’ll have a look at some of those AMS fixes too.
It just seems really strange to me that the “Unload” function works perfectly. Unloading only fails at the end of the print which feels more like a software issue rather than hardware. Does anyone know if the process is any different for unloading the filament at the end of a print?
My Ps1 is brand new, 3 days old. On the two prints I have attempted the filament has required me to manual pull it out as it couldn’t retract back into the AMS…. okay I did that. After the second time, it kept giving me this error,
“Please pull out the filament on the spool holder. If this message persists, please check to see if there is filament broken in the extruder.
(Connect PTFE tube if you are about to use AMS)”
I have taken all filament out and reloaded it, as well as taken the entire extruder apart twice and changed the hotend to be safe. But I was still getting the same error and it refused to print at all.
Then (idk what I did?!) but last night it finally decided to print and did great during the whole 14 hour print session. It even retracted the filament, yay! Then I did a quick 10 minute print right after that, but it couldn’t retract the filament again and now I am fighting the same code. I replaced the PTFE tube inside that connects to the extruder. I looked under the AMS. This thing is only 3 days old. I am not using any external spools, only the AMS, which it now even refuses to load filament into. It also won’t connect to my server from my laptop so I can only print predesigned items from the app. I am at a loss. I submitted a ticket, but at this point I am ready to end this hobby before it even begun.
I feel your frustration. I’ve been battling with issues and problems for 6 months now. I’ve replaced so many parts and done so many upgrades and fixes that I’m feeling the same. Each part dying drives me nuts as I have to order from aliexpress which takes forever to arrive (no there really is no other place I can order BL parts from).
I work 3 weeks hard and then 1 week off which I spend troubleshooting. Generally I get a few days printing before the next part dies or next error crops up. The last month I was waiting on a replacement AP board which cost over $100 to get. Get my week off, replace the board and get 2 days of printing fine. BAM back to this error again.
I can load the filament and watch it feed through to the buffer and then retract in all 4 slots but as soon as I try to print ERROR. I should have stuck to Creality. Guess I’m back to dismantling the whole thing again to see whats broken now.
So far this year I’ve probably had 2 or 3 weeks of runtime and the rest is just waiting for parts or waiting for time off to troubleshoot issues. I was tempted to get the H2D so I can be up and running again but then I think if I’ve had all these issues with a P1S, what is an H2D going to cost in repairs? Seriously considering a K2 and switching back.
Sorry for the rant but omfg its driving me insane.