I’ve had my P1S and AMS for 7 months, and it has worked flawlessly until about a week ago. Now, after almost every automatic filament change, the nozzle gets clogged.
I dehydrate all filaments, store them in low humidity containers, and my AMS is also low humidity. I’ve tried several different nozzles, several different PLA filaments. Nothing seems to help.
All nozzles and extruder gear are HS. Could this be a problem with the extruder gears?
Any help would be appreciated.
Hard to tell. Did you open the extruder? If not, it will not hurt to do a check-up and maintenance.
To reconfirm, it is a nozzle clog? not the extruder? If so, did you replace the complete hotend or the nozzle? My question relates to a possible fault in the probes or heating elements.
No, I haven’t opened up the extruder yet.
The strange thing is that as long as I do not change filament during a print job, everything works correctly. I can change filament from one job to another without a problem. That makes me think the problem must not be in the extruder, but that may be a faulty conclusion I guess I’ll open it up and take a look.
Are you using the new experimental long retraction setting or have you change anything in your machine G-Code to modify the retraction? Have you changed the AMS flush multiplier just before the problem started?
No, I haven’t made any changes like that, at least not intentionally.
Some guesses:
Just to be safe, I changed the filament cutter even though all cuts appeared to be clean. It’s a P1S, so yes, it has an enclosure, but I remove the top glass when I print PLA.
The problem is that the nozzle clogs whenever there is a filament change within a single print. The first filament always extrudes as expected, but the second filament usually can not extrude because the nozzle is clogged. I clean the nozzle, put it back in the printer, and the cycle repeats itself. The first filament always comes out fine.
I am in the Northern Hemisphere. Why is that relevant?
So, does the failure always occur when feeding the new filament?
Sorry. I thought that was a P1.
Summer time. Some users had issues with PLA and higher ambient temperatures during the hotter months. With a 7-month-old, it is the first summer. Yet, usually, the clog happens in the extruder and not the nozzle.
I understand. I live on the US Gulf Coast, so an air conditioner is a must. The air temp inside is pretty close to constant from season to season.The temperature swing from winter to summer is a max of 4 degrees C. I will try a multiple filament print with PETG and see if that makes a difference.
I am getting out of ideas. Sorry.
Can you confirm? The goal is to determine at what stage of the filament change procedure the problem occurs.
The malfunction always occurs during a print with more than one filament. The first filament prints correctly. The second filament fails to extrude. I can hear the extruder gear grinding against the second filament, but nothing gets extruded, the nozzle is clogged.
When I can clean the clogged nozzle and try to print again, the same cycle repeats. First filament prints, but the second one fails.
The whole scenario is quite strange.
I have the same issue, I’m on a P1S with AMS. I’ve had mine for around 1.5 months and having the same ordeal. start a print with one filament and it works perfect then starts to put in the new filament line the AMS will retract and push the filament repeatably before giving an error saying “Extruding filament failed. the extruder might be clogged”. I’m not too sure what to do next. did you get it solved?
Unfortunately, no. I did do one successful multi-color print with a .6mm nozzle, but that was a single print. The success may have been a fluke. Other than that one, I haven’t need to do multi-color prints for a few days, so I’ve just let it slide for now. If I find a solution, I’ll post it.
Is the Nozzle truly clogged or is it just not getting fully fed into the extruder?
Any mods on the extruder entry installed like " extruder tubing guides" which can actually cause feeding issues after some time due to increased leverage on the fitting?
For me, I’m running a fully factory setup, I just swapped hot ends to see if that will help solve the issues. about to start my first multi color since the swap. I don’t think the nuzzle is actually getting clogged because it can do the first color of a multi color print perfectly fine.
Many times these issues come from friction within the tubing due to routing of the tubing between the AMS and the Extruder, wear of the tubing or contamination within the tubing.
Pull the tubing from the extruder and check for wear or damage to the end from the movements it experiences in the fitting.
Also check the buffer that it is working properly without binding.
I also would expect the issue to rely downstream on the extruder, yet I also would expect that the extruder gets clogged and not the nozzle (again, I may be wrong).
I notice now that you didnt specify the nozzle diameter.; I am assuming it’s the 0.4mm.
So, during the filament change, the filament retracts as expected, and the new filament is fed. The issue occurs with the new filament already within the extruder, and I suppose when the old filament purge occurs? Is this correct?
Anyway, I am lost if the temperatures are correct and the downstream path is in mint conditions. You can try to observe the complete filament change process with extra care, looking for something wrong. However, I advise you to contact the BL support team.
sounds like heat soak. Do you have the top cover off and the door open on your p1s?
I always print PLA with the top removed, but not necessarily with the door open. I just tried a 4 color print with the door open, an indirect fan blowing nearby, and a new 0.4 nozzle. The print worked! Hopefully, heat creep was the problem. Thanks.
I’m going to print the same object with a 0.2 nozzle.
I’ve learned to follow Bambu’s filament guidelines with great results. Tomorrow afternoon an 8 day print will finish using a .2 nozzle - PLA Gold and PLA Silver “My Precious” Winged Stone Dragon @ 125% w/ 0.06 layers. It’s the biggest possible size for a P1S.