Stuck filament detection #31101 (CORE One) #26101 (MK4S) #1…

The Prusa CORE One, and the Original Prusa XL, MK4/S, MK3.9/S are equipped with a loadcell. Thanks to this component, starting from firmware 6.0.0, the printer can detect whether the filament is stuck and not moving, for example when the nozzle is clogged.

If this is detected, the print pauses and the printer shows the message: "Stuck filament detected. The filament seems to be stuck. Please unload it from the extruder and load it again."

Once the unload button is pressed, the printer unloads the filament. After this, it prompts filament loading and resumes the print.

It is important to note that detecting stuck filament is possible only inside the Nextruder, as pressure builds up from the nozzle to the upper part of the Nextruder. However, if your filament is tangled on the spool, there will be no internal pressure, just outside tension, which the loadcell won't recognize.

Stuck filament detection won't be possible on MK3.5 and MINI/MINI+ as they aren't equipped with the loadcell sensor.

Screenshot from the Original Prusa MK4

24 comments

Jamie Claye

•

So I inherited a two nozzle XL, was just setting it up to do a two color print and it keeps failing with this message when it goes to the second extruder.

It prints the first color, first layer just fine. When it starts the second color it tries to print the wipe layer but stops and gives me this message.

I've loaded the second extruder with filament and it pumps out filament just fine.

I've tried tightening the nozzle screw but it's good and firm.

If I print to the second extruder it seems to fail about 50% through, with the extruder clicking.

The guy I got it from is not available at this point, not sure if he knows the answer anyway, so here I am.

Is there something special I need to do to do a two color print? FWIW - I have an MK3+MMU2S on r and have lots of multi color experience. So this is my first time riding an XL in this rodeo. ;-)

Balu

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Didn't check, but shouldn't it loose the backpressure of the nozzle? Probably not that much, but maybe a way to implement tangled filament detection (already had it twice with used spooles - where I didn't check them before)

Soebygaard

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It happens to my xl , but only when I start a new print. Newer during a print.
I doudt its related to stuck filement, as it's only when starting a new print. After reloading it works again

Any suggestions hoe to solve

Avinash

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Same for me. I am trying to find out what is causing this “false alarm”. My prints have been coming out perfectly (besides the error message), so I have just turned off the stuck filament detection until I find out the issue. I suggest you do the same; just a short time solution till the problem is located. 🙂

Avinash

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Same thing happens with me on my XL. I am getting perfect prints (besides the false alarm), so I have turned off the stuck filament detection. Just a short term solution for while we figure out what the actual issue is. 🙂

P.S. I have a theory about why this is happening in my case. I am noticing that the first layer is sometimes going so low and thin that hardly any filament is coming out. Sometimes even jamming sounds are coming. This might be what is causing the problem maybe if I recalibrate or adjust the height of the first layer, the problem will be solved. 😉

Avinash

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Hi. I am getting similar issues on my XL: stuck filament detection on first layer. My prints are coming out perfectly, so I turned off the stuck filament detection and inspected how the print was going during the first layer. In my case, I saw that sometimes, the nozzle was set so close to the print board that hardly any filament could come out; filament was not stuck, but in a way, it was jammed. I am now recalibrating my printer to get a smoother first layer. I suggest you try turning off your stuck filament detection and see if anything off occurs on your printing of the first layer. Hope this helps! 🙂

Avinash

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My XL too. I think I figured out my issue: nozzle is too close to print bed and filament is not able to extrude. In other words, the filament (in my case) is not stuck, but is blocked from extruding. I found this out by turning off the stuck filament detection and inspecting the first layer when being printed to check if anything was off. Hope this helps! :)

Linh Dang

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It happen on both XL printer right now.... it's not filement stuck issue something else and get the support i must wait for 30 min... what a joke

acceleratingconductor

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Got this error consistently a few days after running my printer. Troubleshooting led me to that the thumb screws keeping the nozzle in place got loose after operation, which probably makes sense given that the extruder is flung around a bunch when printing, so remember to check that every few prints I guess

Greg Stone

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I'm getting this error on both my XL's now....what "thumb screws" are you referring to? I dont see any thumb screws on mine.

Alessandro Pantaleo

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Hi! So on the XL, we don't have thumb screws to hold the nozzle, but a set screw / grub screw. Its position and access point depend whether it is a single-tool or multi-tool XL.

To check for the nozzle position, you can refer to the "Check if the nozzle is not loose" paragraph from this article https://help.prusa3d.com/article/nozzle-cleaning-failed-xl_395809, even if you are not receiving that particular warning message.

In case of more issues, do not hesitate to let our Technical Support know at any time, we'll help you solve it! https://help.prusa3d.com/article/customer-support_2287

Stuck filament detection

#31101 (CORE One) #26101 (MK4S) #13101 (MK4) #27101 (MK3.9S) #21101 (MK3.9) #17108 (XL)

24 comments