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6.4.0 Firmware for Prusa XL  

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Carl A
(@carl-a)
Estimable Member
RE: 6.4.0 Firmware for Prusa XL

The check is under Settings>Hardware>G-Code Checks and it has 3 options off, warning, strict

Posted : 12/12/2025 5:46 pm
1 people liked
FoxRun3D
(@foxrun3d)
Illustrious Member
RE: 6.4.0 Firmware for Prusa XL

Maybe it is always on now. 

It is always on in firmware now. So you need to update your printer profiles in Configuration Assistant to Original Prusa XL-5T Input Shaper, to avoid getting the g-code warning. Or disable the warning as described above but I would suggest updating your 3mf project files with the new printer settings.

Formerly known on this forum as @fuchsr -- https://foxrun3d.com/

Posted : 12/12/2025 5:59 pm
1 people liked
Carl A
(@carl-a)
Estimable Member
RE: 6.4.0 Firmware for Prusa XL

Not sure whare to find Configuration ASSISTANT in Slice 2.9.4. I have looked at Configuration Wizard, check for configuration updates and application updates. Everything says that I am up to date.

Posted : 12/12/2025 6:57 pm
Carl A
(@carl-a)
Estimable Member
RE: 6.4.0 Firmware for Prusa XL

Looked in the wrong place. Have found it and applied. Had been usinging the Original 5T .4 nozzle before. Thanks.

Posted : 12/12/2025 7:03 pm
1 people liked
Carl A
(@carl-a)
Estimable Member
RE: 6.4.0 Firmware for Prusa XL

Looked in the wrong place. Have found it and applied. Had been usinging the Original 5T .4 nozzle before. Thanks.

Posted : 12/12/2025 7:03 pm
Marcin Stroszejn
(@marcin-stroszejn)
Member
RE: 6.4.0 Firmware dla Prusa XL

Ciekawe Kiedy PRUSA naprawi/zaktualizuje ten wadliwy "nowy" firmware ???

Posted : 22/12/2025 6:50 am
Fallon
(@fallon)
Trusted Member
RE: 6.4.0 Firmware for Prusa XL

Same, 100% failure rate at the cleaning step at the start of every print I believe. Probing seems slower as well, but I don't keep a close eye on it. It's super frustrating to have to manually intervene on the cleaning every time.

Posted by: @1eye

I'm still having these issues with failure to complete a nozzle cleaning and this annoying "probe the bed a stupid amount of times" issue. How do we turn this off but keep the 6.4.0 firmware? What should be a 30 minute print takes an hour because it insists on probing around each probe point. I have cleaned the nozzle several times and it still goes through this annoying process. This was never an issue before. 

https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-hardware-firmware-and-software-help/5t-xl-never-passes-stuck-filament-or-bed-leveling-anymore/#post-771943

 

Posted : 28/12/2025 11:05 pm
2 people liked
1Eye
 1Eye
(@1eye)
Eminent Member
RE: 6.4.0 Firmware for Prusa XL

I get that an occasional failure can/should happen if the control is solving a problem but this, for me at least, was not a problem before. Whatever was introduced is not working. It has introduced a massive bug into the process. 

Posted : 30/12/2025 6:06 pm
1 people liked
Prune
(@prune)
Active Member
RE: 6.4.0 Firmware for Prusa XL

Also getting the `The G-code isn't fully compatible` on my 5 head XL with 6.4.0 firmware and everything else updated.
If it is needed to switch to the `Prusa XL-5T Input Shaper` profile, it should be communicated upfront... this is so silly...

Also, I wasn't able to ever use the `Prusa XL-5T Input Shaper` profile because calibrating for input shaping always fails... So maybe there should be a better procedure to make that work.

This is pretty unfortunate... I understand Prusa needs to keep selling stuff like the new Core one, but we paid a pretty high price for the XL, and we want to be considered as customers, not let-go...

Posted : 30/12/2025 8:20 pm
Prune
(@prune)
Active Member
RE: 6.4.0 Firmware for Prusa XL

I opened an issue at https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/5061  for tracking

Posted : 30/12/2025 8:28 pm
Darryll Truchan
(@darryll-truchan)
New Member
RE: 6.4.0 Firmware for Prusa XL

No trouble at all then this.  layer shifts,  extruding failures, printer reboots, too cold to heat heater.  I had to roll back.   No trouble again.   

Posted : 04/01/2026 2:52 pm
1 people liked
jan.d.slay
(@jan-d-slay)
Trusted Member
RE: 6.4.0 Firmware for Prusa XL

 

Posted by: @darryll-truchan

No trouble at all then this.  layer shifts,  extruding failures, printer reboots, too cold to heat heater.  I had to roll back.   No trouble again.   

Yes, that's right. Since downgrading to 6.2.6 and numerous print jobs, there have been no errors, crashes, or other incidents.

My printables
Prusa XL - Quick Start Gcode
Posted : 04/01/2026 4:26 pm
Juzam
(@juzam)
Active Member
RE: 6.4.0 Firmware for Prusa XL

Phase stepping is completely broken in this version in my case. Instead of reducing vibrations, the calibration is actually amplifying them. Impossible to stay in the same room with the printer. Same gcode with 6.2.6  is dead silent. 

Posted : 05/01/2026 4:05 pm
ktastrophe
(@ktastrophe)
Eminent Member
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