Link lost #35331 (CORE One L) - Hardware, firmware and software help

RE:

Ruebarb — Sun, 17 May 2026 18:54:33 +0000

I went back to 6.5.3, not much of choice if I want the MMU3 to work, as that was the first compatible firmware. I have not seen the issue repeat, just finished a 24hr print. The hard rest which reformats and then reinstalls the firmware "solved" the issue.

RE: Link lost #35331 (CORE One L)

alkaba — Sun, 17 May 2026 17:15:53 +0000

So did the older FW fix your issue? I still dont have my replacement Core One L. This is taking forever and I am really considering if this was a good choice.

RE: Link lost #35331 (CORE One L)

Ruebarb — Sun, 26 Apr 2026 11:52:55 +0000

Thanks, I completed 20hrs of prints without issue. So if you saw this issue on the 6.5.2. Then it appears to be an issue with the firmware in general, we can assume then, the hard reset did clear the issue for now.

RE: Link lost #35331 (CORE One L)

alkaba — Sun, 26 Apr 2026 06:57:36 +0000

I've had these Link lost faults also on 6.5.2...

RE:

Ruebarb — Sat, 25 Apr 2026 19:32:59 +0000

Reported issue to Prusa CS last night, useless as usual. "WE are investigating this issue. Unfortunately, With complex printers, the issues can be complex too "

Downgraded to 6.5.2, Hard Rest to 6.5.2. Printer was off last night. Started cold printer this morning, successfully printed the 8 hr print. Doing another shorter print and then will do again the same 8hr print. I really hope this is a firmware issue for 6.5.3 and not a hardware issue.

RE: Link lost #35331 (CORE One L)

Ruebarb — Sat, 25 Apr 2026 00:48:51 +0000

Just happened again, no good correlation

RE: Link lost #35331 (CORE One L)

Ruebarb — Fri, 24 Apr 2026 22:38:26 +0000

Supposedly the C1L are delayed for weeks due to a nozzle issue. I wouldnt surrender the printer until I get the replacement.

RE: Link lost #35331 (CORE One L)

alkaba — Fri, 24 Apr 2026 22:03:06 +0000

Not yet, still waiting for them to pick up the faulty printer.

RE: Link lost #35331 (CORE One L)

Ruebarb — Fri, 24 Apr 2026 21:53:53 +0000

You already received the replacement C1L? I tried CS, but appears the indx release must have them busy. I sent an email, but will be contacting them by chat when the wait is short.

RE: Link lost #35331 (CORE One L)

alkaba — Fri, 24 Apr 2026 21:00:41 +0000

Posted by: @ruebarb
Crash-o-matic at it again, appears to happen after printer has been on/printing for long period of time 20+hrs, atleast that is all I can correlate with 2 failures.

That really sucks... The worst is, that it happens on these long prints. Mine was about 12hrs, yours 20+. My print always failed around 90-95% which sucks even more. And it was from a really expensive material... My printer is ready to ship Back to prusa and i am waiting for the parcel company for pickup.

Ironically... My frankenstein core1 built from scrap and mk3.5 parts is printing everyday without any failure...

Did you contact the prusa support?