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Power Outage - Can I resume the print?  

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Malabor
(@malabor)
Active Member
Power Outage - Can I resume the print?

Hey folks!

I had a bad storm go through over the weekend (Florida!)  and we lost power for several hours.   My print was ALMOST finished (less than 25% to go) when the power went out.    Once the power came back on, the printer reset and there's no option to RESUME.   Am I out of luck, or is there a setting / option that I'm missing?

thanks in advance for any help!

-C

Posted : 14/06/2021 3:13 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Power Outage - Can I resume the print?
Posted by: @malabor

Hey folks!

I had a bad storm go through over the weekend (Florida!)  and we lost power for several hours.   My print was ALMOST finished (less than 25% to go) when the power went out.    Once the power came back on, the printer reset and there's no option to RESUME.   Am I out of luck, or is there a setting / option that I'm missing?

thanks in advance for any help!

-C

The Prusa Mini does not have a power panic function. The problem is also that in the event of a longer power failure, the print bed may cool down and the printed part/s may come loose.

https://forum.prusaprinters.org/forum/general-discussion-announcements-and-releases/prusa-mini-and-power-outage/

Given that the print part still sticks to the print bed, you could possibly try to edit the gcode manually so that the print resumes where it left off.

wbr,

Karl

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 14/06/2021 7:06 pm
fuchsr
(@fuchsr)
Prominent Member
RE: Power Outage - Can I resume the print?

And invest into an uninterrupted power supply (UPS). 

Posted : 15/06/2021 12:46 am
mrstoned
(@mrstoned)
Estimable Member
RE: Power Outage - Can I resume the print?

Another option to complete the print, depending on it's geomitry, can be to measure the height of the failed print, load the stl in slicer and cut it to that height and just print the top remaining part and glue them together.

But yes, as fuchsr wrote, if power is unreliable or not "clean" a ups should be used.

Tevo Nereus.
Prusa Mini+ kit. BondTech extruder....
Posted : 15/06/2021 7:52 am
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Power Outage - Can I resume the print?

A good UPS is quite expensive. Furthermore, with a theoretical power consumption of 160 watts, the thing should have sufficient reserves to be able to compensate power outage for a longer time.

I would possibly think about the idea of @mrstoned.

wbr,

Karl

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 15/06/2021 4:33 pm
Malabor
(@malabor)
Active Member
Topic starter answered:
RE: Power Outage - Can I resume the print?

Good call with the UPS.  I may see if I can pick one up.   It's coming up on storm season here and power outages are pretty common where we live.  Thanks everyone for your help!

-C

Posted : 17/06/2021 4:49 pm
BogdanH
(@bogdanh)
Estimable Member
RE: Power Outage - Can I resume the print?

Maybe some thoughts before you click "buy"... because UPS specifications (Watts or VA) can be quite deceiving.

Most consumer UPS's use single 12V battery, which can be either 7Ah or 9Ah. Let's take 9Ah as an example:
12V x 9Ah = 108W/h
That means, if printer consumes 108W, then UPS should be able to supply power for period of 1 hour -but that's the theory! In reality, UPS conversion from 12V-DC to 115V or 230V-AC introduces very big losses (next factor, which also shortens supply time, is quality of battery itself). In short, you can expect printer to run for about 30min's on UPS (also depends on filament you use).

You can decide for UPS which has two 12V batteries inside (12V+12V 9Ah =24V 9Ah = 216W/h) and so double your printing time -compared to single battery UPS.
Battery inside UPS will last for about 4-5 years and then needs to be replaced.

Posted : 17/06/2021 5:48 pm
Malabor liked
Malabor
(@malabor)
Active Member
Topic starter answered:
RE: Power Outage - Can I resume the print?

@bogdanh

this is a great point.  Most of the time, the printer is going to need more than 30 minutes or so to run and our power outages can range anywhere from seconds to hours.    What I'll probably do is just keep things the way they are and plan around the big storms.  If I know it's going to get nasty out, I'll hold off on printing anything until it clears up.  

I'm hoping that this storm season isn't as bad as they say it's going to be and I won't have to worry about it. 😀

Thanks again for all of your help and suggestions!

-C

Posted : 18/06/2021 12:54 pm
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