Firmware Bug: Random Print Pause, Time Loss
 
Notifications
Clear all

Firmware Bug: Random Print Pause, Time Loss  

  RSS
Ruebarb
(@ruebarb)
Estimable Member
Firmware Bug: Random Print Pause, Time Loss

The print randomly pauses and then continues. The print continually loses time during the print, not just the pauses. Sent this all to CS

Video

https://drive.google.com/file/d/1tr0_4jlXSuRr25PzPc6kYNY7PdaA89wF/view?usp=sharing

 

 

 

Core One L MMU3, MK3S

Posted : 19/02/2026 5:15 pm
_KaszpiR_
(@_kaszpir_)
Noble Member
RE: Firmware Bug: Random Print Pause, Time Loss

File uploaded via PrusaConnect or PrusaLink directly to the usb?

See my GitHub and printables.com for some 3d stuff that you may like.

Posted : 21/02/2026 9:44 am
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE: Firmware Bug: Random Print Pause, Time Loss

PrusaLink to USB

Posted by: @_kaszpir_

File uploaded via PrusaConnect or PrusaLink directly to the usb?

 

Core One L MMU3, MK3S

Posted : 21/02/2026 1:17 pm
_KaszpiR_
(@_kaszpir_)
Noble Member
RE:

Does it happen if you reslice it without G2 Arc Fitting ?

Can you share the currently used gcode?

Another idea - replace pendrive?

See my GitHub and printables.com for some 3d stuff that you may like.

Posted : 21/02/2026 1:56 pm
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE:

Haven't tried it without the G2 Arc Fitting. 36hr print, not repeating it, it did finish, with some defects from the pause, but for it's purpuse they aren't noticable. This pause happened many times.

I'm not using the Prusa USB, Higher speed samsung USB, uploading via Prusalink is quicker with it.

Hasn't happened on any other prints yet.

https://drive.google.com/file/d/1NAFY01oFgMsukolYOv-qVsAoFFoYzmcG/view?usp=sharing

Core One L MMU3, MK3S

Posted : 21/02/2026 4:40 pm
hyiger
(@hyiger)
Famed Member
RE:

I can hear the nextruder gears clicking. Maybe jam detection is causing this. Are you printing PLA? I doubt this is a firmware bug. If you still believe it is then you need to open an issue on github: https://github.com/prusa3d/Prusa-Firmware-Buddy/issues

Posted : 21/02/2026 5:31 pm
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE: Firmware Bug: Random Print Pause, Time Loss

The clicking is the sound of my keyboard with Prusa CS. This is PLA.

Core One L MMU3, MK3S

Posted : 21/02/2026 5:37 pm
hyiger
(@hyiger)
Famed Member
RE:

 

Posted by: @ruebarb

The clicking is the sound of my keyboard with Prusa CS. This is PLA.

Ah OK. LOL. Anyway, I think it's a filament jam causing this. I don't print a lot of PLA anymore (especially on a Core One). Try turning off filament jam detection. 

Posted : 21/02/2026 5:53 pm
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE:

There was no clicking like a jam would indicate, no errors detected, why would the printer pause. Typically is just keeps on going with a jam. How does it unjam itself over and over again without extruding. It just pauses, waits, then continues. CS was thinking it was acting like a power loss, no power issues were occuring. To me seems like it was waiting for data to be transmittted, also the ETA of the print kept lossing time continously, even when it was printing, not just the pauses, the preview of the model screen was also blank. The ETA times on the main screen and preview screen also didn't match. Seems alot more logic then mechanical.

Core One L MMU3, MK3S

Posted : 21/02/2026 5:58 pm
hyiger
(@hyiger)
Famed Member
RE: Firmware Bug: Random Print Pause, Time Loss

 

Posted by: @ruebarb

There was no clicking like a jam would indicate, no errors detected, why would the printer pause. Typically is just keeps on going with a jam. How does it unjam itself over and over again without extruding. It just pauses, waits, then continues. CS was thinking it was acting like a power loss, no power issues were occuring. To me seems like it was waiting for data to be transmittted, also the ETA of the print kept lossing time continously, even when it was printing, not just the pauses, the preview of the model screen was also blank. The ETA times on the main screen and preview screen also didn't match. Seems alot more logic then mechanical.

The binary g-code would be on the USB. Yes is gets streamed to the firmware. Perhaps the USB key has a problem? Have you tried swapping it out? This is what I use in mine: https://www.sandisk.com/products/memory-cards/microsd-cards/industrial-microsd?sku=SDSDQAF3-008G-I

Posted : 21/02/2026 6:02 pm
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE: Firmware Bug: Random Print Pause, Time Loss

I've been running SAMSUNG FIT Plus 3.1 USB Flash Drive, 128GB, 400MB/s, formatted for FAT. Flusher fit and much faster than the Prusa USB.

Core One L MMU3, MK3S

Posted : 21/02/2026 6:23 pm
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE: Firmware Bug: Random Print Pause, Time Loss

I'll give the scan disk a try, simpler to deal with FAT on smaller storage anyway.

Core One L MMU3, MK3S

Posted : 21/02/2026 6:32 pm
hyiger
(@hyiger)
Famed Member
RE:

 

Posted by: @ruebarb

I'll give the scan disk a try, simpler to deal with FAT on smaller storage anyway.

I have two of these SanDisk Industrial MLC MicroSD one in the buddy cam and one for printer. The printer uses a very low profile USB adapter  But then maybe Prusa should get away from 15 year old tech (the Buddy Board) STM32F407VGT6 and something a bit more modern with built-in eMMU

Posted : 21/02/2026 7:51 pm
1 people liked
mctaggart
(@mctaggart)
Member
RE: Firmware Bug: Random Print Pause, Time Loss

I used this same drive and ran into the same exact problem/phenomenon. Switching to a usb 2.0 drive removed the problem entirely for me. I don't know why but these printers don't seem to either like usb 3.1 or samsung drives. 

Posted by: @ruebarb

I've been running SAMSUNG FIT Plus 3.1 USB Flash Drive, 128GB, 400MB/s, formatted for FAT. Flusher fit and much faster than the Prusa USB.

 

Posted : 05/04/2026 1:01 am
Ruebarb
(@ruebarb)
Estimable Member
Topic starter answered:
RE: Firmware Bug: Random Print Pause, Time Loss

Thanks, glad to know it wasn't jsut me. Been using the drive & SD card Hyiger mention, no issues

Posted by: @mctaggart

I used this same drive and ran into the same exact problem/phenomenon. Switching to a usb 2.0 drive removed the problem entirely for me. I don't know why but these printers don't seem to either like usb 3.1 or samsung drives. 

Posted by: @ruebarb

I've been running SAMSUNG FIT Plus 3.1 USB Flash Drive, 128GB, 400MB/s, formatted for FAT. Flusher fit and much faster than the Prusa USB.

 

 

Core One L MMU3, MK3S

Posted : 06/04/2026 12:07 pm
vhubbard
(@vhubbard)
Reputable Member
RE: Firmware Bug: Random Print Pause, Time Loss

Verbatum usb 3.0 drive gave me fits also.  Primarily failing to load correctly from Prusaconnect or directly from PrusaSlicer.   While some state a 3.0 USB will work, the firmware in the buddy boards is for 2.0 usb drives.  I went to a good quality 16 Gig drive USB2.0 and have had no problems since. 

Posted by: @ruebarb

Thanks, glad to know it wasn't jsut me. Been using the drive & SD card Hyiger mention, no issues

Posted by: @mctaggart

I used this same drive and ran into the same exact problem/phenomenon. Switching to a usb 2.0 drive removed the problem entirely for me. I don't know why but these printers don't seem to either like usb 3.1 or samsung drives. 

Posted by: @ruebarb

I've been running SAMSUNG FIT Plus 3.1 USB Flash Drive, 128GB, 400MB/s, formatted for FAT. Flusher fit and much faster than the Prusa USB.

 

 

 

Posted : 06/04/2026 3:33 pm
1 people liked
Share: