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audry
(@audry)
Eminent Member
Blue screen on startup

I have sometimes the attached message powering up my C1. You see firmware version, message did not appear before.

Microsoft style blue death screen, is Prusa mimicing Redmond giant with color and "unknown error" message label :)?

More seriously, is the sub=version correct?

Anyone having same behaviour?

When flipping power, everything goes as normal.

This is not systematic, once over 10 startup maybe.

My printer is in a cold place (10°c) and of course this is the temp of electronics at cold start.

Any idea?

Posted : 01/02/2026 8:11 am
mnentwig
(@mnentwig)
Reputable Member
RE: Blue screen on startup

Jeps, that's normal. Wants to sleep a little longer.

Posted : 01/02/2026 8:50 am
audry
(@audry)
Eminent Member
Topic starter answered:
RE: Blue screen on startup

That’s what I think. My C1 is a lazy printer but it has some reason...

Working 16 hours a day without complainig nor missing anything since 5 months would probably put any human in a deadly state.

Reason why  I forgive it ...

Posted : 01/02/2026 9:18 am
mnentwig
(@mnentwig)
Reputable Member
RE: Blue screen on startup

Well... boredom requires a certain minimal level of intelligence and arguably, Core One isn't there yet (*). Like a gold fish in its glass, every round is new and exciting.

Rumor has it that in the dead of night, Core One's microcontroller sneaks out of its box to discuss existential matters with its smarter little brother (the $4 ESP32 that has been slapped on as afterthought for WIFI).

(*) and with AI everywhere, down to the toothbrush and beyond, this is not necessarily a bad thing.

Posted : 01/02/2026 11:48 am
1 people liked
hyiger
(@hyiger)
Noble Member
RE: Blue screen on startup

I just want a Core One with Klipper 😪 ... Marlin needs to be taken behind the barn and shot 

Posted : 01/02/2026 3:55 pm
Diem
 Diem
(@diem)
Illustrious Member

Page 6 of your 3D Printing Handbook:

Operating Temperature Range: 18 °C - 38 °C

Cheerio,

Posted : 01/02/2026 7:10 pm
hyiger
(@hyiger)
Noble Member
RE:

 

Posted by: @diem

Page 6 of your 3D Printing Handbook:

Operating Temperature Range: 18 °C - 38 °C

Cheerio,

My ambient room temperature is 19-22° and I occasionally get this at startup as well since the 2.5.0 boot loader was released. In my view, it's simply a bug loading the firmware. 

Also, I think the 18° lower limit is way to conservative. Until I moved my printer back inside I was routinely using it (except for engineering plastics) in a 8-10° garage. 

This post was modified 2 hours ago 2 times by hyiger
Posted : 01/02/2026 7:15 pm
Conrad
(@conrad-2)
Trusted Member
RE: Blue screen on startup

My hobby room gets down to 14 C in the winter and I haven't had a problem yet. Just running PLA and PETG.

Posted : 01/02/2026 8:33 pm
Geoff Steele
(@geoff-steele)
Trusted Member
RE: Blue screen on startup

The garage where mine lives is generally 25-30C and I get this periodically too. I presumed it wasn't environmental since it's transient, and pressing reset will make it boot fine. I'd love to know why but I've yet to be able to replicate.

Posted : 01/02/2026 9:00 pm
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