Yes It was  a USB cable  problem 

Thanks for help Doron

will try other cable

Printer is MK4 upgraded to MK4S, firmware 6.1.3.

Unless you're running something else on the Pi that might reset ports, my best guess is poor cable or connection.

Posted by: @sonra

Hi

Thanks for replay

 

No i do connect the DOK to the display port (as you only when update OS of  the printer

1)Can you  check what ver of OctoPrint you use?

2)   Can you try to  print  large file on your MK4 ?(may be printer model   problem ) 

3)  if you try on your MK4 and it work can you check what software framework is installed on the MK4printer 

I don' t know if  you read me original  topic in the forum but the problem happens  after few hours of printing with no problem

and i can print small /medium size files

Hope no big problem for you  

Regards  Doron

 

 

 

 

 

0

3) 

My printer is currently printing, so I cannot start another print right now. But I have checked what the biggest files were I printed on it since the last upgrade of the OctoPi image. All ran without a problem:

Thanks for replay

No i do connect the DOK to the display port (as you only when update OS of  the printer

1)Can you  check what ver of OctoPrint you use?

2)   Can you try to  print  large file on your MK4 ?(may be printer model   problem ) 

3)  if you try on your MK4 and it work can you check what software framework is installed on the MK4printer 

I don' t know if  you read me original  topic in the forum but the problem happens  after few hours of printing with no problem

and i can print small /medium size files

Hope no big problem for you  

Regards  Doron

0

3) 

I would suggest removing the USB drive from the MK4 and give it another try if it works that way for you.

About the file size I use with OctoPrint, see screenshot from today. I also have a similarly sized print currently running on my MK3S+ and I have printed files sized over 90 MB in the past with no problem.

-rw-r--r-- 1 octoprint-mk4 octoprint-mk4 67M May 26  2024 'SStopfmitloechern v5_0.4n_0.2mm_PETG_MK4ISMMU3_13h30m.gcode'

Largest file I've successfully printed (that's still lying around on the Octoprint instance) -- Its a flower pot.

(Dedicated PI4, USB attached SSD, LACK enclosure, but its generally left slightly open for heat reasons - The PI/SSD are both external to the MK4).

In the middle of a 6 hour print (but its only 12Mb of gcode).

I'd agree w/ Scott, and lean toward your PI environment, and/or cable... 

Hi

Did any one of you try to print big file ( >20Mbyte) using the OctoPrint and it work ?

all my tries was stop after few hour with  serial exception error  you can see the  full story in  a post that  i wrote and did not get any

response from this forum or the OP forum

MK4  Framework   6.1.3

I doubt I have printed a gcode file that large with Octoprint, but file size should not matter -- commands are sent to the printer one-by-one.  I have certainly printed 12+ hours-long prints, whereas the last failure was at 3hours 15 minutes. That's a relatively short time, and I routinely have prints longer that that which complete without any issues.

I found your logs on the Octoprint forum and reviewed them.  From the logs, the issue does not look like an Octoprint problem or Rpi power problem.  The error you are getting indicates a communication loss (i.e., either the printer stopped responding to Octoprint, or communication between the two was lost). 

It *could* be a Prusa firmware fault, but I have not experienced this or seen anyone else report it.  What was the state of the MK4 screen after this happened?  Did it still show "serial printing"?  Was it responsive?  Was it still heating the bed and toolhead?  There have been (rare) overheating problems with the buddy board; particularly with long prints in an enclosure, a few folks have had it "red-screen" and spontaneously reboot.  

It *could* be a bad cable, poorly shielded cable, or loose cable connection. An easy test would be to replace the cable and try again.  

It *could* be some other process on the Pi interfering with comms.  Do you have anything other than Octoprint running on the Pi?

Did any one of you try to print big file ( >20Mbyte) using the OctoPrint and it work ?

all my tries was stop after few hour with  serial exception error  you can see the  full story in  a post that  i wrote and did not get any

response from this forum or the OP forum

MK4  Framework   6.1.3