I bought a new P1S a few weeks ago, and I’ve been having enormous fun and success with it so far in building mini PC cases.
Last night though I got this error from one of the spools. The filament was tangled, but since it was nearly empty anyway I thought maybe it somehow related to this, and installed a new one (like-for-like PLA Metal).
However, the same thing happened again overnight during the print. There was a tangle where it must have pushed back the filament but the presumably the spool wasn’t turning or something so it just tangled up around the spool instead.
It’s a print with supports, so I guess it was the first time it had to retract the main filament in order to build some support. I then moved the filament to a different slot, and it’s all been working fine again.
What might cause just a specific spool to not retract properly? I checked the wiki, and it mentioned making sure the roller was seated properly, which it is.
Do I have to start taking things apart?! I hope not, and wondered if anyone had encountered this. As I say, it’s only the one spool, the others seem to be working ok.
“Failed to pull back the filament from the toolhead to AMS. Please check whether the filament or the spool is stuck. After troubleshooting, click the retry button.”
It’s worked fine from pretty much day one (I have mostly only used PLA Metal so far), and it’s working fine right now in another slot, retracting as required when it needs to swap with PLA Support.
But it failed three times in a row in one slot, which is now empty while I try and figure it out.
My advice, having gone through several of these, find out where your filament is binding. Filament breaking is honestly rare, and most people I have talked to who have also had this experience have found the same thing as me: the filament was getting bound up somewhere in the reverse bowden tube system between the print head and the AMS.
Common places:
The AMS Buffer or hub on the back of the printer.
The path to and from the Buffer or hub
Inside the printer from where it comes to the print head
Some have reported binding in the 4 tubes that feed the feeders.
Once you figure out where your bind is, you can find a fix on Makerworld. There are tons of good ones out there.
Failed to pull back filament error can be caused by multiple different factors. This is a part of a series of AMS fixes that i have created which i do suggest you install all my fixes together for the proper effect to help your filament travel properly across the entire system which in turn can help improve, reduce or remove any potential AMS errors.
Unfortunately there isn’t a single fix that can 100% work for everyone. What works for others, may not work for you but my fixes is definately a great place to start and have worked for majority of the users. My fixes are precisely measured then modelled. A Proper Fix would have the highest chance to reduce or solve the error. Pls ensure you follow all installation guide carefully.
Surely if it’s only 1 spool, 100% repeatable at the moment, and all other spools are 100% ok, then this rules out 1, 2 and 3 and it must be the first stage feeder if the specific tubes related to the dodgy spool are all clear? Unless it’s the whatever-it’s-called under the AMS where the pipes from the feeders converge?
The other thing I noticed earlier, is that it no longer “grabs” the filament when I push it in, like the other spools do. So maybe its sensor-related.
i spent weeks staring at the AMS loading and unloading. I may have a good idea on what is going on however there are a lot of variables, My fixes cannot work for everyone but at more than 90% positive feedbacks i think its pretty good. Its free to try anyway nonetheless.
My issue was simply a failed first stage feeder. When I replaced it with a new one everything worked fine again.
I disassembled the old one but didn’t see anything obvious, no clogging etc. It looked pretty much ok visually, so presumably some of the electronics had gone awry.