CORE One Heat Break and Chamber Temperatures
Just a quick observation on CORE One temperatures with the enclosed chamber, I searched and didn't see it covered but I may have missed it. Printing PETG I'm trying to keep temps down as much as possible because I am seeing more stringing and blobs than with the MK4. During a long PETG print I ran the printer door open lid off, door open lid on and door closed lid off. The chamber fan is set to 30% which is still pretty quite. Overall I saw the lowest heat break and chamber temps door open lid on. The heat break temp goes up about 5 deg with the door closed regardless of the lid. With the lid on and door open the air flow through the chamber seems to be a little better but not a big difference in temp, a couple of deg. With both the door an lid closed the chamber temp goes up at least 5 deg or more even with the fan turned up. The fan gets loud around 40% and that's not enough to keep the chamber cool with both closed.
I wondering if the heat break temps might stay lower with the door closed if I printed this? The printer is quiter with the door closed and lid off
https://www.printables.com/model/585199-prusa-core-one-mk4-fan-cover
RE: CORE One Heat Break and Chamber Temperatures
I can try and let you know. I actually have my printer modded such that the top is magnetically attached, so I can test your particular use case. I've been looking for a bit of a fan guard anyway so this kinda works out.
RE: CORE One Heat Break and Chamber Temperatures
Unless you like the fan cover, I don't think it is worth the time to print it out.
For PETG and PLA I usually run mine with the top open and fans at 40%, ambient temp usually around 23-26C. With the fan cover on, the chamber temperature seemed only marginally lower (1-2C) and won't make any difference. For PLA, the temperature still climbed to 30C or so with the top off.
Additionally, I don't think you will get away with 30% fan speed either without the front door open. The fans and intake design are actually one of the gripes I have against the Core One, as much as I love my printer. It seems like an afterthought, as if Prusa intended the Core One to be specifically for higher-temp filaments and only added the vents and fans in to market it as PLA/PETG compatible.
Also, not sure if you have tried this, I've noticed the presets for non-Prusa filaments tend to have the nozzle temperature too high. You can try lowering them by 5-10C? The only filament I did not have to make any adjustments for was actually Elegoo Rapid PETG.
RE: CORE One Heat Break and Chamber Temperatures
I also find the filaments I have tested work better at lower temps. The Fan was 30% but that was door open top off. I have since turned it up printing door closed. I haven't printed any PLA yet but plan to soon. PETG was giving me some issues and I may need to go back and refine my profile. I was printing it top off. PCTG seems to be doing pretty well top on and one of the standard profiles has a 40 deg chamber temp which I'm trying out now with good results.
Heat break temperature went up more than I expected even with the top off and I'm not sure how much that will effect print temperature if any.