Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
Hi everybody, I did notice one unpleasant thing.
Yesterday I finally got an Advanced Filtration for Prusa CORE One. I installed it and enabled it in the settings.
But during a print I noticed that the chamber temperature is much higher than I set in the settings. The desired temperature was 35C but the actual temperature in the chamber was 41-42C.
I found that the 2 chamber fans are not spinning when the advanced air filtration system is enabled in the settings. And it looks that air filtration fan is not powerful enough to maintain the desired temperature of the chamber. So during the whole print I had only air filtration fan spinning, the two chamber fans were switched off. More over I noticed that if the advanced air filtration system enabled the two chamber fans even don't participate in fan self test.
The support didn't help much, they sad that the fans will switch on if the temperature rise up, but frankly speaking I have doubts because the self test was not performed for the chamber fans when air filtration is enabled. And during my 1,5 hour print I didn't see/hear the chamber fans working.
Has anybody noticed that behaviour? Is it expected?
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
The chamber fans not working with the filtration kit installed is expected behavior. The release notes for firmware version 6.3.1 outlines some of the behavior of the printer with the kit installed:
https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.3.1
It says:
"Note: When enabled, the Advanced Filtration System also takes over chamber temperature control and disables the cooling fans (with the exception of critical overheat situations)."
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Oh, I suspected it, but it looks that the sole fan can't maintain the desired temperature. In my case the temperature was higher by 6-7C than the setting.
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I also have the problem with the advanced filter on the core one and the chamber temperature not sufficiently cooled down. I have the advanced filter fan at 100% and still the temperature climbs >32°C which is too much for PLA and causes a lot of stringing.
It would be great if the original fan continued to support the air extraction instead of being useless even though the advanced filter cannot cope with the required air-flow.
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Same issue here, even in a very cool basement, the advanced filtration fan alone can't keep the chamber temp down to ideal PLA levels. The two chamber fans did the job perfectly. Running the two chamber fans will probably cause a filtration efficiency downgrade (due to air leaks) but it's definitely needed if the scroll fan can't keep up.
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It would be great if the original fan continued to support the air extraction instead of being useless even though the advanced filter cannot cope with the required air-flow.
I am afraid the standard chamber fans would be pretty useless (as in, without effect) even when turned on. They are just not designed to push air against a large resistance, like the one introduced by the filter.
A larger, stronger high-pressure fan would be the only way to force enough air through the filter. But that would probably mean a larger enclosure and filter area as well, so don't expect to just fit a new blower yourself. -- It is disappointing that Prusa have designed the "Advanced Filtration System" for the Core One with an undersized fan. I guess they wanted to stick with the theme they have set with the Buddy camera. 😕
If you still can, return the filtration system for a refund. Or get used to the idea of removing it for all PLA and PETG prints, and only attaching it for the higher-temperature filaments. (Which happen to be the ones with more unhealthy emissions too.)
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
I haven't had any problems printing PLA or PETG on my Core One with the kit installed. Am I missing something?
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
I haven't had any problems printing PLA or PETG on my Core One with the kit installed. Am I missing something?
All reports on the advanced filtration system I came across have mentioned chamber temperatures on the order of 5 °C higher than before. Maybe you are running the printer in a cool place, e.g. in the basement, and that gives you some margin with the chamber temperature?
You do print PLA and PETG with the door closed, right? What is the room temperature, and what actual chamber temperatures do you get during extended prints?
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
I definitely don't keep the printer in a cool space. It's in the hottest part of the house which during summer (now) only gets cooled to, at best, 25C. Chamber temps hover around 35C while printing. Door closed, top vents open.
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
You're 100% correct. I just tried a PLA print with the chamber fans and advanced filtration fan (the scroll fan) all at 100% and there was no impact on chamber temp (vs. just the scroll fan). Like you said, the chamber fans are not the correct design for any kind of pressure differential.
I wish the filter was quickly removable, it would make it much easier to just remove it for PLA/PETG. With no plug on the fan side, there is really no way to just take the filtration system off w/o removing the back panels.
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You can print them fine, it's just that w/o the filtration installed the Core One kept the chamber temp exactly on point. With advanced filtration it's 5-10C over the target. In my case for a PLA print, chamber is set is set to 20C and during an extended print I'm at 28-30C chamber temp. For reference the printer is in my basement with an ambient temp of 18C.
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
Chamber temps hover around 35C while printing.
That is hot, possibly too hot in my opinion, especially for PLA. Prusa has specified the target chamber temperature, which the fans aim to reach, at 20°C. It's always several degrees higher in my Core One after say 15 minutes of printing, but I don't think I have seen it reach 30°C.
Did you change other settings to compensate -- e.g. let the heatbreak fan run more aggressively? I would be concerned that the cold end of the heatbreak gets too warm and the filament already becomes soft there.
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
Zero chance the chamber ever being 20C here. Maybe in the dead of winter. 35C hasn't caused any issues for me, works fine. I've done many multi-hour PLA printers without issue. 🤷🏻 Stock print profiles.
I don't monitor the heatbreak temp. Prusa Connect doesn't show it in the telemetry either so I can't comment on that.
RE: Problem with chamber temperature management with Advanced Filtration for Prusa CORE One
I have had zero issues with PETG (and the occasional PLA print) with doors closed. Haven't looked at what temperatures I get. You can always leave the door open, I guess. Like I did with my LACK enclosures before the Core One.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/