RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
After some more experimentation, it seems that setting the chamber fans to 0% disables the chamber temperature control which should allow it to be manipulated above 55c manually.
I still feel that the 55c limit is too low and needs revising up to (say) 65c to cater for the high temp hotend and use of higher end filaments in the Core One. Hopefully the devs will reconsider.
The chamber is heated passively by the heat bed. Even with the heat bed at 120° (which is as high as it can go) and an insulated chamber the max I was able to reach was 60°. Beyond that, the chamber will need an active heater. And, as I pointed out in a previous post, the acrylic panels (door, side panels) will start to warp and the love board electronics might start having issues if one goes above this.
It really isn't "up to the devs" in that there is nothing firmware-wise that will make it go hotter. Essentially the entire printer enclosure would need to be redesigned. Hopefully Prusa will introduce a Core One HT.
RE:
I will install active heating control in my C1+ and not wait until the heating bed has heated up the chamber.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
... the acrylic panels (door, side panels) will start to warp ...
The panels are not acrylic, by the way, but polycarbonate. At least that is what Jo Prusa stated at release (when they pointed out that it's not glass and hence "Uncle-Jessy-proof"). I could not find official specs in a quick search.
That seems like a good choice: While slightly less clear than acrylic, polycarbonate has better mechanical strength and chemical resistance, and a higher melting temperature: https://cambrianplastics.co.nz/product/acrylic-vs-polycarbonate/ Nevertheless, the doors and panels are a limiting factor for the chamber temperature, as you state. They don't need to get anywhere near the melting temperature; it's enough that they expand on the heated inside while staying cool on the outside.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
@hyiger @jurgen-7, very valid points. However, I have seen no sign of warpage at temperatures up to 67c on longish prints up to 12 hours.
My issue is that there seems to be a hard limit on the chamber temp setting which means that the chamber fans will trigger at 55c instead of the 60-65c I may have set. I am not convinced there is a real issue with the panels or I would have seen many comments from Voron users whose machines are typically enclosed with acrylic or polycarbonate panels and used at 60-65c.
There seems to be a workaround for this by disabling the chamber fans so they don’t trigger prematurely and cap the temperature the chamber can reach. However this means there is no active chamber cooling control at the higher temperatures which is not ideal. Perhaps I should look into the active chamber heating project(s) when they are a bit more mature.
Meanwhile it would be nice if the 55c limit could be raised to 65c or allow the user to set the upper limit in the UI
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
... the panel is probably less heat sensitive than the door sealing. I wouldn't trust that not to become sticky and messing up the door...
... the acrylic panels (door, side panels) will start to warp ...
The panels are not acrylic, by the way, but polycarbonate. At least that is what Jo Prusa stated at release (when they pointed out that it's not glass and hence "Uncle-Jessy-proof"). I could not find official specs in a quick search.
That seems like a good choice: While slightly less clear than acrylic, polycarbonate has better mechanical strength and chemical resistance, and a higher melting temperature: https://cambrianplastics.co.nz/product/acrylic-vs-polycarbonate/ Nevertheless, the doors and panels are a limiting factor for the chamber temperature, as you state. They don't need to get anywhere near the melting temperature; it's enough that they expand on the heated inside while staying cool on the outside.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
The CORE One L uses most of the same parts (same LoveBoard) and has a slightly higher chamber temp limit of 60c. So either they were being cautious with the 55c limit until they'd done further testing and now they could raise it to 60c, or maybe it's expectation setting. The CORE One L has a more powerful bed plus fans to circulate hot air so it can hit 60c under normal conditions, whereas the CORE One can only hit 55c normally (without maxing the bed and covering with towels). So perhaps they just don't want to oversell its capabilities. That said they could still advertise 55c wile increasing the limit for tinkerers.
Since even the CORE One L is limited to 60c I wouldn't try going above that. As others have said there are lots of things that could fail or have a shorter lifespan - LoveBoard, door foam, LEDs and adhesive, oils and greases, motors, plus thermal expansion of metals potentially throwing things off. Though the Buddy3D camera is rated to 65c and actively heated Bambu printers go to 65c so perhaps Prusa is being more cautious than necessary, I don't know.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
We have four MK4S printers. After about two weeks with this firmware, two regressions appeared on one of them.1) The material sensor stopped working, so we had to turn it off.2) Nozzle cleaning failed – it ran for a long time in two rows, even though the nozzle was visibly clean; we had to select "Ignore" for printing.Restarts did not solve the problems.After uploading the firmware back to 6.2.6, everything was fine.Theoretically, it could be a hardware problem with the board, but that would be a coincidence, as the printer has never had similar problems before.I am now trying firmware 6.4.0 again, so I will see if it reappears and let you know.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
I went through the belt tension wizard and was able to get definite frequency readings. Very nice.
One minor comment, instead of telling me to turn the screws, "6/8 of a turn", "3/4 of a turn" would be more intuitive.
RE:
I went through the belt tension wizard and was able to get definite frequency readings. Very nice.
One minor comment, instead of telling me to turn the screws, "6/8 of a turn", "3/4 of a turn" would be more intuitive.
Actually, even turning the screws, 1/8 of a turn can make a big difference tension frequency. So 6/8 or 3/4 is a lot. Think of it then as: turn 45° six times.
Be thankful it didn't ask you to "Turn the screws 4.7124 radians"
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
This joke is a good one 👍
So 6/8 or 3/4 is a lot
I went through the belt tension wizard and was able to get definite frequency readings. Very nice.
One minor comment, instead of telling me to turn the screws, "6/8 of a turn", "3/4 of a turn" would be more intuitive.
Actually, even turning the screws, 1/8 of a turn can make a big difference tension frequency. So 6/8 or 3/4 is a lot. Think of it then as: turn 45° six times.
Be thankful it didn't ask you to "Turn the screws 4.7124 radians"
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
I've already enjoyed the new version. 🤔
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
I've already enjoyed the new version. 🤔
That's the alpha version. You might want to upgrade to the full release? Anyway, the BSOD is still there in the final release but it's apparently harmless.
RE:
I have the full version. I borrowed the photo from the internet.
I didn't get that message in the RC version.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
Poprvé co uvažuji, že vrátím starší verzi firmware.
1) Autoretrakce - před upgradem jsem při výměně filamentu nemusel čekat na zahřátí trysky, nyní ano PROČ???, když by filament neměl být v trysce!!! Předtím vyjel filament za studena.! Volbu autoretrakce mám zapnutou.
2) Měření bodů podložky trvá déle- Nemám to měřené stopkami, ale pouhým pozorováním vidím časový rozdíl, bohužel k horšímu.
3) Otevírání mřížky - provede se pouze poprvé po připojení k napájení tiskárny. Nemám potřebu tiskárnu po každém tisku vypínat a tak když nedopatřením, nebo z jakéhokoli jiného důvodu, třeba prašnost zavřu, tak se již automaticky neotevře. Předpokládal jsem že takto triviální operace by se mohla provádět pro jistotu před každým tiskem třeba při nahřívání hotendu. Klidně další položka v menu, ať to otevírá při PLA a PETG pokaždé, pro jistotu.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
For the first time I'm considering returning an older firmware version.
1) Autoretraction - before the upgrade I didn't have to wait for the nozzle to warm up when changing the filament, now I do WHY???, when the filament shouldn't be in the nozzle!!! Before, the filament came out cold.! I have the autoretraction option turned on.
2) Measuring the pad points takes longer - I don't have it measured with a stopwatch, but by just observing I can see the time difference, unfortunately for the worse.
3) Opening the grid - it is only done the first time after connecting to the printer's power supply. I don't need to turn off the printer after each print, so if I close it by mistake or for any other reason, for example, due to dust, it will not open automatically. I assumed that such a trivial operation could be performed just to be sure before each print, for example when heating the hotend. Feel free to add another item to the menu, let it open with PLA and PETG every time, just to be sure.
Since this is the English section of the forum, please translate your posts before submitting them.
I don't think you have to wait for the heater before you can unload filament, that's not how my printer behaves with firmware 6.4.0. I also do not notice a change in bed probing time.
Agree that Prusa's decision not to set the vent grille before every print (and close it afterwards to avoid dust ingress) is not the best choice. You can add custom Gcode to your printer settings to make that happen -- see here.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
I've already enjoyed the new version. 🤔
That's the alpha version. You might want to upgrade to the full release? Anyway, the BSOD is still there in the final release but it's apparently harmless.
Yeah Ive just been shrugging it off with a quick reset, never caused a problem ......until yesterday:
97% of the way through a 6 hour print...POWER CUT!!
I swore loudly, then I remembered the power panic function, I thought I might be ok.... Until the power came back on and I'm greeted by the BSOD, which obviously ruined the chance of resuming after power cut 😂
So the one time I needed to try the power panic function the BSOD cruelly took that option away from me. I still have no idea if the power panic function even works as described.
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
So after resetting/power cycling after the BSOD, I guess the print didn't resume?
I had one successful power panic resume. I plugged my C1 into a TPlink smart plug so I could turn it on or off remotely using Alexa or the TPlink app, and forgot that (reassigned) plug was part of a group already. So in mid print when I told the Amazon devil spawn from hell to turn off that group, off went the C1 in mid print. After remotely switching it back on, it picked right up and i couldn't find the slightest hint of the interruption in the final print.
I've already enjoyed the new version. 🤔
That's the alpha version. You might want to upgrade to the full release? Anyway, the BSOD is still there in the final release but it's apparently harmless.
Yeah Ive just been shrugging it off with a quick reset, never caused a problem ......until yesterday:
97% of the way through a 6 hour print...POWER CUT!!I swore loudly, then I remembered the power panic function, I thought I might be ok.... Until the power came back on and I'm greeted by the BSOD, which obviously ruined the chance of resuming after power cut 😂
So the one time I needed to try the power panic function the BSOD cruelly took that option away from me. I still have no idea if the power panic function even works as described.
RE:
So after resetting/power cycling after the BSOD, I guess the print didn't resume?
No, no option to resume...after I reset the BSOD it just went to the normal Home Screen. I made an attempt at editing the gcode trying to print the final 3% but it must've been midway through a layer when the power went off so my attempt didn't end well 😂
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
Ah crap. Oh well, no such luck. Sorry to hear it. At least it was only 6 hours… 🙄
RE: 6.4.0 Firmware for Prusa CORE One + & CORE One
So after resetting/power cycling after the BSOD, I guess the print didn't resume?
No, no option to resume...after I reset the BSOD it just went to the normal Home Screen. I made an attempt at editing the gcode trying to print the final 3% but it must've been midway through a layer when the power went off so my attempt didn't end well 😂
I can see why a reset (withthe button) on the BSOD didn't restart the print, it would have been interesting to see the result of pulling the plug out of the outlet instead of resetting...