Filament runout #31829 (CORE One) #35829 (CORE One L) #1782…

What happened?

This message appears when the printer detects that the filament has run out during a print. The sensor has triggered a pause, and the printer is waiting for new filament to be inserted. The message shown is Filament runout during print, please insert new one.

This is a normal and expected function, triggered by the filament sensor to prevent failed prints when the spool runs out.

Error name: Filament runout

Error code: #31829 (CORE One) #35829 (CORE One L) #17829 (XL) #26829 (MK4S) #13829 (MK4) #27829 (MK3.9S) #21829 (MK3.9) #28829 (MK3.5S) #23829 (MK3.5) #12829 (MINI)

How to fix it?

Insert new filament when prompted. Follow the on-screen instructions, and the printer will heat up and guide you through the change.
Ensure the new filament is fully loaded and correctly extruding before confirming.
Once ready, press Continue on the printer’s LCD to resume printing.

This feature helps protect long prints from failing due to an empty spool. If you encounter false runouts, check the filament sensor wiring, cleanliness, and whether the filament path is smooth and free of friction.

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4 comments

Jaroslav Pazout

•

I have same problem. Switch off and on printer (yes it is contraintuitive, but printer remeber last printing position), then disable filament sensor, reload filament and continue in printing. You have to have enough filament to finish all your work, otherwise ...

pds

•

The printer asks if the filament unload was successful, I pull out the filament first to check and it comes out easy so I click yes to this prompt. After clicking yes it then says to remove the filament from the sensor, which I already did, because how could I possibly know if it worked properly if I had not checked. I am now stuck on this page with no way to get off.
This article does not explain the steps or it what order. Am I doing something wrong? How is this feature supposed to work? How do I get the printer to load the filament when it is in this state?

leoNautrik

•

Im having a simmilar issue to Alesmine where the prusa iniatates a filament change even though theres still filament in both sensors. I guess the sensors are bad, but would be nice to have some quick troubleshooting on this page.

Mine is not stuck as the extruder has backed out the filament to initiate the change

BBQ and Games

•

Just got my Core One last week. So far this has happened twice. The second one I had happened to have logging on. Indeed the sensor is triggering a filament runout even though I had half a spool. Literally pulled it out and put it right back in. Did you ever figure out the cause? Wondering if it is a wiring issue causing the filament sensor to trigger.

Jan Kratochvíl

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Hello. This might be more things. There can be imperfections of the filament diameter and FS in the nextruder reads lower values and determine filament runout. You can recalibrate filament sensor with this filament to see if it helps. Or you can contact our support team for help via livechat.

Jaroslav Pazout

•

I used Prusament PLA.

Alesmine

•

Incorrect info. New spool, after few layers I have the error message to replace the filament. No a runout filament issue. No way to continue printing. I cannot take out the filament since it's securely hold into the extruder and the display is stuck on error page, no "continue" button available.

Martin Prenger

•

see this thread, if you haven't already:
https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4-hardware-firmware-and-software-help/filament-changing-bug/paged/2/#post-761310

Had the exact same issue with my MK4S. Since my MK4S in a Prusa Enclosure, I loosened the PFTE tube and was able to (easily) remove the remaining piece of filament. Put the PTFE tube in again, fed the printer some new filament and it continued to load. My print continued , thankfully 😀

However, Prusa, this needs to be fixed ASAP !