XL freezing

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3D Printing Tips and Tricks

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Jan 8, 2026, 11:09:50 AM (3 days ago) Jan 8
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This is a new issue. After solving a slicing problem related to color, now the XL is freezing. First time it happened I sent the file to it via Prusalunk, so the assumption was corrupted gcode. Sliced it again and put it on a thumb drive and it froze again. Resliced it again and switched to a new thumb drive and it froze again. Each time it freezes it’s within four or five layers of the same z height…. This indicates that its an issue with the fw or the board. Next I’ll downgrade the fw and try again.

Kurt

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Jan 8, 2026, 3:06:05 PM (3 days ago) Jan 8
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Maybe this is a Dumb suggestion. But, did you recently do a Slicer update? Maybe try slicing in another slicer (although - that's probably not an option - as it's for the XL - But, I don't really know)...

-K

3D Printing Tips and Tricks

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Jan 10, 2026, 1:00:24 PM (yesterday) Jan 10
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I went back to an earlier firmware build and now it works fine.

Kurt The 3D Printer GUY!!

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Jan 10, 2026, 4:18:33 PM (yesterday) Jan 10
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Awesome - Good to see the FW rollback fixed your issue!!!

That being said - it HAS to be a known issue - happening to MANY Users - and Prusa MUST Know about the problem! Have you seen any bug reports about it???

Yeah - I'm just really curious...

-K

Alan B

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Jan 10, 2026, 4:46:27 PM (yesterday) Jan 10
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Xl on latest release firmware, no hangups noted.


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Kurt The 3D Printer GUY!!

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Jan 10, 2026, 8:19:53 PM (yesterday) Jan 10
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So - Alan - you're saying - you got a Firmware release AFTER the one Andy installed?

I'm keeping a close eye on this thread - as it's a VERY Curious thing to me - the error Andy reported - and interesting that it was Firmware related. Am not Shocked by this kind of problem - but, I WILL Admit - I think it is something that is Software related that should have been Caught before it was released. Yeah - I know it's actually FW - but, it's basically SW on the HW. 

Enough said...

And - yeah - that's coming from ME - a SW/Programmer guy by day...

-K

Alan B

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Jan 10, 2026, 10:21:48 PM (24 hours ago) Jan 10
to Kurt The 3D Printer GUY!!, 3D Printing Tips and Tricks
I have 6.4.0, the current version, and have not had issues with my 5 head XL. It was built as a single head, upgraded to two, and then to five. I've used various versions of Prusa Slicer with it and not experienced hangups. Just a data point that might or might not be useful.

Alan


3D Printing Tips and Tricks

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1:21 AM (21 hours ago) 1:21 AM
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Yes, that was the version I was using when the freezes occurred.
It happened on prints that were over 24 hours in time and with over 1000 toolchanges. All the same object. I’ll be sending the 3mf to Prusa tomorrow.
Look for the Roots Pot in Makerworld.
The tree elements are printed with textured coloring of brown and black as I did with the colored can holder last Oct.

Alan B

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1:47 AM (20 hours ago) 1:47 AM
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We have had some over 24 hour prints on this firmware, but not that quantity of tool changes.


Kurt The 3D Printer GUY!!

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5:08 PM (5 hours ago) 5:08 PM
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Yeah - I bet you it's really the large amount of Tool Changes that is causing the problem. Oddly, from a programming standpoint - it's almost like there is some kind of a Memory stack that gets filled up - and then the printer hangs up. But, I have no idea why there would be a saving of a large amount of data that would cause something like this. But, yeah - I'm just kinda spit balling here...

Definitely post the Roots Pot creation/link here - once you make it live on MakerWorld Andy! I really wanna see that  - cause those colored Can Holders last year you posted were Awesome!!!

-K



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