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Power-Panic & Prusa Connect  

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REB
 REB
(@reb-2)
Active Member
Power-Panic & Prusa Connect

Hi,

Does the Power-Panic feature work when printing via Prusa Connect? I have just suffered a brief (20-30 secs max) power cut midway through a couple of prints on my two Mk4S printers (one with MMU3), and neither printer restarted after the power came back on.

I know it never worked when printing via OctoPrint, but I thought it would (should?) work via Connect, as the print file is downloaded to the printer's USB stick.

Thanks.

 

Posted : 21/01/2025 12:59 pm
REB
 REB
(@reb-2)
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Topic starter answered:
RE: Power-Panic & Prusa Connect

Any thoughts? Someone out there must know the answer. 🙂

Posted : 23/01/2025 10:15 am
Mike B
(@mike-b-3)
Estimable Member
RE: Power-Panic & Prusa Connect

As long as the file was completely downloaded from Prusa Connect to the printer, I would expect it to restart the print.  You might have to be at the printer to allow it to continue however (selecting OK or Resume or something - can't remember the exact procedure).  In your scenario, what did the LCD look like when the power returned?

Prusa MK4 since Jan 2024, Printables: @MikeB_1505898

Posted : 24/01/2025 5:42 am
REB
 REB
(@reb-2)
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Topic starter answered:
RE: Power-Panic & Prusa Connect

 

Posted by: @mike-b-3

As long as the file was completely downloaded from Prusa Connect to the printer, I would expect it to restart the print.  You might have to be at the printer to allow it to continue however (selecting OK or Resume or something - can't remember the exact procedure).  In your scenario, what did the LCD look like when the power returned?

Thanks for the reply. The files were definitely fully downloaded to the printers, which were about 2 hours into 4 and 5-hour prints. I was stood in front of the printers as the mains power came back on, but they both just booted up as though they had just been switched on, with the default home screen displayed on the LCDs. There was no option to continue the prints.

Just to clarify, I am using PrusaSlicer 2.9.0 to send the .bgcode files to the printer via the 'send and print' option (1st in the list). The firmware on both printers is 6.1.3+7898.

Posted : 24/01/2025 8:35 am
Mike B
(@mike-b-3)
Estimable Member
RE: Power-Panic & Prusa Connect

Then I am sorry - I have nothing else to suggest.  I hope someone else has experience with this...

Prusa MK4 since Jan 2024, Printables: @MikeB_1505898

Posted : 25/01/2025 7:14 am
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REB
 REB
(@reb-2)
Active Member
Topic starter answered:
RE: Power-Panic & Prusa Connect

As I haven't received an answer here, I have raised the question on the 'Prusa-Firmware-Buddy' repository on GitHub.

Posted : 31/01/2025 4:13 pm
REB
 REB
(@reb-2)
Active Member
Topic starter answered:
RE: Power-Panic & Prusa Connect

Just had another brief power cut (20 seconds or so) during a print, and again, the power-panic feature didn't kick in.

Really annoying 2 hours into a 4-hour print.

 

Posted : 30/03/2025 7:07 pm
REB
 REB
(@reb-2)
Active Member
Topic starter answered:
RE: Power-Panic & Prusa Connect

Bizarrely, when I turned my printer on this morning, the printer offered to continue the print that was running yesterday during my brief power cut. A bit late, as I'd already removed the failed print and binned it.

Posted : 31/03/2025 7:40 am
LarGriff
(@largriff)
Reputable Member
RE: Power-Panic & Prusa Connect

 

Posted by: @reb-2

Bizarrely, when I turned my printer on this morning, the printer offered to continue the print that was running yesterday during my brief power cut. A bit late, as I'd already removed the failed print and binned it.

That is very strange!

Just guessing here, but I’d check to make sure the power panic cable is properly connected at the power supply and the xBuddy board.

https://help.prusa3d.com/guide/6-xlcd-assembly_707776#716951

https://help.prusa3d.com/guide/6-xlcd-assembly_707776#717263

MK4S/MMU3

Posted : 31/03/2025 2:42 pm
REB
 REB
(@reb-2)
Active Member
Topic starter answered:
RE:

 

Posted by: @largriff

 

Posted by: @reb-2

Bizarrely, when I turned my printer on this morning, the printer offered to continue the print that was running yesterday during my brief power cut. A bit late, as I'd already removed the failed print and binned it.

That is very strange!

Just guessing here, but I’d check to make sure the power panic cable is properly connected at the power supply and the xBuddy board.

https://help.prusa3d.com/guide/6-xlcd-assembly_707776#716951

https://help.prusa3d.com/guide/6-xlcd-assembly_707776#717263

 

Thanks for the reply. I plan on checking the cables on both of my Mk4S printers later in the week once I'm back from a couple of days away. Although, as I built both machines, I'm reasonably positive they are connected correctly.

Posted : 31/03/2025 2:48 pm
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