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6.4.0-RC Firmware for Prusa CORE One  

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mnentwig
(@mnentwig)
Estimable Member
RE: 6.4.0-RC Firmware for Prusa CORE One
Posted by: @hyiger

 ... As long as you don't have an XL then you'll be fine

Yes, and I've been using it for a while, zero real issues so far (BSOD at power-on but it's just a nuisance).

What I meant, they shouldn't hold back new potential versions. Unpaid software testing for the greater good is generally something a community is very good at 🙂

Posted : 03/11/2025 7:33 pm
Tim
 Tim
(@tim-21)
Member
RE: 6.4.0-RC Firmware for Prusa CORE One

I subscribe to that old school rule, if it isn't broken, don't fix it.  Unless an update fixes something I am personally experiencing, then why waste the time to change anything.

Posted : 04/11/2025 3:21 am
Steve
(@steve-33)
Trusted Member
RE: 6.4.0-RC Firmware for Prusa CORE One

Why is it taking so long to get from Core One RC to release? I suspect it's to do with release of the new Core One L and devs working on that instead!!

Posted : 04/11/2025 10:57 am
1 people liked
ssill2
(@ssill2)
Noble Member
RE: 6.4.0-RC Firmware for Prusa CORE One

I don't think adding yet another printer is doing prusa any favors to prusa's ability to support existing customers.

Posted : 04/11/2025 11:05 am
2 people liked
Tim
 Tim
(@tim-21)
Member
RE: 6.4.0-RC Firmware for Prusa CORE One

In my experience if a company can't replicate a build, bit by bit binary compare equal, with mutiple compiles on multiple systems/users, their dev system is broken. 

The only things that should affect the checksums is the actual revision coded into the build and the checksum itself. But once these are set: the version should be as buildable next year as it is today.

Posted : 06/11/2025 1:09 am
1 people liked
aln.perez
(@aln-perez)
Reputable Member
RE: 6.4.0-RC Firmware for Prusa CORE One

 

Posted by: @jim-22

Just loaded it again with the same problem of filiment sensor detects filiment when there is none in the extruder.

reverting back to 6.3.3 so I can continue printing...

PS Bambu H2S and D prints circles around the Core One!!!! 

Thanks,

Jim

 

That's just your opinion, but it's a bit like a car: either you pilot it, or you drive it, or you let the Chinese AI do it.

MK3S + MMU2 migrée vers une MK4 +MMU3 , puis vers MK4S MMU3, puis upgrade vers Core One, Elegoo Mars, bricole sur Home assistant, arduino, 8266, Esp32, kicad, Freecad et Fusion 360

Posted : 06/11/2025 6:38 pm
Print_Fandango
(@print_fandango-2)
Member
RE: 6.4.0-RC Firmware for Prusa CORE One

My thoughts as well. It is too long of a wait. 

Posted : 07/11/2025 2:37 am
hyiger
(@hyiger)
Noble Member
RE: 6.4.0-RC Firmware for Prusa CORE One

I'd rather wait it out, get something that's been QA'd (internally) than to get a buggy release. There are still lots of reported bugs: https://github.com/prusa3d/Prusa-Firmware-Buddy/issues

Posted : 07/11/2025 4:31 am
1 people liked
sabre666
(@sabre666)
Active Member
RE: 6.4.0-RC Firmware for Prusa CORE One

Same, I only install new firmware in general for any equipment one or two months after the final release. 

Posted : 10/11/2025 11:51 am
DeFo
 DeFo
(@defo)
Member
RE: 6.4.0-RC Firmware for Prusa CORE One

Even though the belt tuning was correct and the upgrade from my MK4S was done very precisely, I started having more and more issues with homing week by week. I’ve now switched to the RC version — and look at that, it’s working again just like on my MK4S. Great!

There’s a small firmware bug, but it’s not really annoying. After a print finishes, the extruder moves to Y = 211 mm. If I don’t move it back to Y = 0 mm after clearing the print bed, it struggles with homing the next time. But once you know that, everything’s fine.

Thanks for the early RC release — it really helped me!

Posted : 10/11/2025 12:02 pm
samuel-t
(@samuel-t)
Eminent Member
RE: 6.4.0-RC Firmware for Prusa CORE One

My thoughts as well. RCs didn’t take that long in the past, but I agree with hyiger - I’d rather wait until it’s thoroughly tested.

Posted : 10/11/2025 2:45 pm
hyiger
(@hyiger)
Noble Member
RE: 6.4.0-RC Firmware for Prusa CORE One

 

Posted by: @samuel-t

My thoughts as well. RCs didn’t take that long in the past, but I agree with hyiger - I’d rather wait until it’s thoroughly tested.

We'll probably see either the next RC or release soon but not until they make their FormNext announcements after the 18th. I would wager there will be support in the new firmware for a Core One S or INDX add-on and they don't want to spoil the surprise. 

Posted : 10/11/2025 2:50 pm
Jürgen
(@jurgen-7)
Noble Member
RE:

The download page for the Core One L does not offer any firmware yet. About time they add it; if the first printer orders were shipped on time last Friday, they should reach their users real soon now.

I am keen to see whether that will be the official 6.4.0 release. It does not seem to make much sense to branch out a dedicated Core One L firmware, given that the printer is so similar to the regular Core One.

Posted : 10/11/2025 3:03 pm
hyiger
(@hyiger)
Noble Member
RE:

 

Posted by: @jurgen-7

The download page for the Core One L does not offer any firmware yet. About time they add it; if the first printer orders were shipped on time last Friday, they should reach their users real soon now.

I am keen to see whether that will be the official 6.4.0 release. It does not seem to make much sense to branch out a dedicated Core One L firmware, given that the printer is so similar to the regular Core One.

Or they are still trying to fix the XL toolhead crash before they release as well. Anyway, would be interesting to note which version of the firmware the Core One L has installed on it from the factory. 

This post was modified 2 weeks ago by hyiger
Posted : 10/11/2025 3:14 pm
1 people liked
ssill2
(@ssill2)
Noble Member
RE: 6.4.0-RC Firmware for Prusa CORE One

my XL and MK4S are still on 6.2.6, and the Core one 6.3.4. It'll stay that way until I see better feedback on here. I'm still shaking my head that prusa introduced yet another printer line they have to support.

Posted : 10/11/2025 3:17 pm
chmax
(@chmax)
Reputable Member
RE: 6.4.0-RC Firmware for Prusa CORE One

 I did notice this morning that there is a new 6.5.1 FW tag, so I expect this to show up with release notes etc etc in a couple of days; it may be a "C1 L only" drop to ship the new machine with a production version, it may be a universal version fixing a bunch of problems ... I am really curious to see what gets in it... 

Posted : 10/11/2025 3:32 pm
2 people liked
hyiger
(@hyiger)
Noble Member
RE:

 

Posted by: @chmax

 I did notice this morning that there is a new 6.5.1 FW tag, so I expect this to show up with release notes etc etc in a couple of days; it may be a "C1 L only" drop to ship the new machine with a production version, it may be a universal version fixing a bunch of problems ... I am really curious to see what gets in it... 

It's definitely for the Core One L since the Core One can never reach this high with the 24V bed:

v6.5.1: chamber: Increase chamber temperature to max 60deg C selectable from UI

This post was modified 2 weeks ago by hyiger
Posted : 10/11/2025 3:39 pm
chmax
(@chmax)
Reputable Member
RE: 6.4.0-RC Firmware for Prusa CORE One

in a multi-printer release all possible options are covered ... some of which will not be available on all platforms. That said, w/r to the temp setting, I certainly hope this is not the only thing fixed in this release 😀 😀 

Posted by: @hyiger

 

Posted by: @chmax

 I did notice this morning that there is a new 6.5.1 FW tag, so I expect this to show up with release notes etc etc in a couple of days; it may be a "C1 L only" drop to ship the new machine with a production version, it may be a universal version fixing a bunch of problems ... I am really curious to see what gets in it... 

It's definitely for the Core One L since the Core One can never reach this high with the 24V bed:

v6.5.1: chamber: Increase chamber temperature to max 60deg C selectable from UI

 

Posted : 10/11/2025 4:33 pm
1 people liked
hyiger
(@hyiger)
Noble Member
RE: 6.4.0-RC Firmware for Prusa CORE One

When they dump their internal repo into the public repo it doesn't look like they are copying the commit history. So it's really hard to diff the tags in github to see exactly what has changed. Example, when I compare 6.4.0 and 6.3.5 I see commits from January. 

Posted : 10/11/2025 5:02 pm
Koen Kooi
(@koen-kooi)
Trusted Member
RE: 6.4.0-RC Firmware for Prusa CORE One

git log —oneline v6.4.0-rc..v6.5.1 works fine for me.

Posted : 10/11/2025 5:50 pm
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