Filament 'stuck', but not really after latest 6.4.0
 
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Filament 'stuck', but not really after latest 6.4.0  

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Danut Tabacaru
(@danut-tabacaru)
Member
Filament 'stuck', but not really after latest 6.4.0

Hi All,

The latest firmware introduced this auto retract feature.

Seemed weird to me at first, and still not sure if I want it enabled by default, but i left it on to see if how I'd feel about it after some time.

However, ever since it starting doing this maneuver , occasionally (maybe 1/5 prints) will report 'filament stuck' right after the print starts and the first line is extruded to prime the extruder.

The filament is NOT stuck... I simply click on unload/load and it loads it automatically without me doing anything. It was clearly not stuck because it extruded that first line without issue...

Seems like a firmware issue?

Posted : 10/12/2025 4:59 pm
LarGriff
(@largriff)
Reputable Member
RE: Filament 'stuck', but not really after latest 6.4.0

https://forum.prusa3d.com/forum/postid/773033/
This problem with firmware version 6.4.0. has been reported by numerous people.  Most have reverted to firmware 6.2.6.  Prusa is not what it used to be.

MK4S/MMU3

Posted : 11/12/2025 2:12 pm
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