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MK4 Filament stuck again and again  

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Jason Mack
(@jason-mack)
Member
MK4 Filament stuck again and again

Printer: MK4
Purchased and built: Mid July, this year
Filament Printed: 5249g to date
Filament Used:  100% PLA (various types/sources)

I'm basically unable to print right now. Intermittently, I'll get a "filament stuck" error, where it'll push it out, I'll feed it back in, then sometimes it'll print.

I can hear a CLICK CLICK with the feeder having the issue pushing the filament through just before it goes to the "filament stuck" error.

With this much filament printed, should I expect the need to replace my print head already?  Curious....as this is what I was going to do to try and fix.

 

Posted : 08/12/2025 7:04 pm
jan.d.slay
(@jan-d-slay)
Trusted Member
RE: MK4 Filament stuck again and again

When I got my new Prusa XL, I printed 2 kg of PLA in toolhead 1. Then I put the same filament in toolhead 2 and the same thing you described happened.

I then tightened the screws until the rattling at least decreased. I turned off the setting in the ‘Stuck filament detection’ menu.

Are you printing with 0.4 mm? How high is the heatsink temperature when the error occurs? What does the filament look like behind the idler? Is it deformed and compressed?

My printables
Posted : 09/12/2025 9:55 am
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