Advanced Filtration System - Remove Original Chamber Fans?
I have been using the Advanced Filtration upgrade since building my Core One. The installation instructions for the advanced filter did not call for the removal of the original two chamber fans during it's installation. I have noticed that the original chamber fans are deactivated when the advanced filtration setting is enabled and they never run. Wouldn't keeping the original fans in place when using the advanced filtration system cause an additional flow resriction that could reduce chamber temperature control or otherwise decrease the flow through the advanced filter? Could the original fans be removed or relocated as they are still used for critical overheat situaions?
RE: Advanced Filtration System - Remove Original Chamber Fans?
The flow restriction created by the fan blades is probably negligible compared to the flow restriction presented by the HEPA filter. And for the high-temperature, nasty-emissions filaments you don't need a huge airflow anyway: You want just enough to ensure that no air diffuses out through the various open slits of the enclosure, but rather a bit of air is sucked in there and pushed out via the filter. So I don't think you need to remove the stock fans to obtain efficient filtration.
On the other hand, the HEPA filter presents a massive obstacle when you want a lot of air exchange for a cool chamber. So yes, it would be nice if the stock fans could blow out air through an unobstructed opening in that scenario. But the enclosure does not offer an extra opening (unless you want to take a can opener to it 😉). And you would have to seal that opening somehow when you want to use the filtration, since otherwise it would present a major leakage path for unfiltered exhaust fumes into your room.
So I think you are best off to leave Prusa's arrangement unchanged for now. If you find that the chamber temperature drifts too high when you print PLA or PETG, remove the filtration pack from the back. (User reports vary whether that is necessary, probably due do different ambient temperatures.)
There has been some discussion in the Core One User Mods forum whether a re-circulating filtration solution could be built, maybe positioned inside the chamber. Here, and I think there was an earlier discussion which I can't find right now. Maybe watch that space or join that discussion if you are interested in improved filtration solutions.