Optional filtration unit design error? - General discussion, announcements and releases

RE: Optional filtration unit design error?

_KaszpiR_ — Sat, 07 Feb 2026 22:03:29 +0000

> But I think blowing in the warm filtered air is better then sucking in could air. I guess could air will result in more unwanted turbulence inside the chamber.
yes, you could make a pipe returning back to the enclosure, but the design of the Core One / Core One L would require adjustments because it was not designed for it. It was designed to slowly get colder air form the outside so that the fans are generating negative pressure, keeping the fumes insine and direct them through the filter. Pushing the air back would probably generate positive pressure and thus the hot air with the fumes would run away through the holes, which is undersired, or would require additional chamber around the printer. Either way I do not know how the current air filtration works precisely, but I would suspect it would not turn on the fans in the heatup/print phase - only at the end to clean up the air.

> I looked at your printables. But I do not see any printables that deal with filtering and air flow back in the chamber. Do I miss something?
No, you do not miss anything from my collections, they rather do not contain pipes for the air extraction from Core One L. You need to search printables on your own. For example https://www.printables.com/model/1540074-prusa-core-one-l-particle-evacuation-o80o100o125-d (I suggest using search and using tag:coreonel to filter out entries)

RE: Optional filtration unit design error?

simmania — Sat, 07 Feb 2026 10:25:56 +0000

Posted by: @_kaszpir_
Directing air outlet to tye ventilation is recommended, but not required if you got the filter.
There are some examples in the printables, ...

I looked at your printables. But I do not see any printables that deal with filtering and air flow back in the chamber. Do I miss something?

RE: Optional filtration unit design error?

simmania — Sat, 07 Feb 2026 08:53:52 +0000

Posted by: @_kaszpir_
...
Blowing air back to the cabin could cause drafts that can influence the print, and thus cause warping.

But I think blowing in the warm filtered air is better then sucking in could air. I guess could air will result in more unwanted turbulence inside the chamber.

RE: Optional filtration unit design error?

_KaszpiR_ — Sat, 07 Feb 2026 08:25:40 +0000

Directing air outlet to tye ventilation is recommended, but not required if you got the filter.

There are some examples in the printables, you just need to search and decide on your own, but for now I cannot recommend anything yet, maybe someone else will?

RE: Optional filtration unit design error?

simmania — Sat, 07 Feb 2026 01:04:21 +0000

So when I understand correctly, one needs to connect a hose to the filter output and connect the other side to a room outlet connection so the air from the printer chamber goes outside the room?
Then tell me how we should connect a hose to the filter outlet. It is not designed to connect a hose.

RE: Optional filtration unit design error?

_KaszpiR_ — Fri, 06 Feb 2026 23:40:20 +0000

Main role of the filtration system is to filter out big particles, and some VOC and direct the air to the pipes which direct air outside of the room through the ventilation.

People mostly block holes in the top part of the printer so that the hot air is not escaping on its own.
Holes on the bottom of the printer are useful to allow air to get in, they are pretty small so it's not a major problem.

Either way you want the holes - the fans will generate negative pressure if needed, so that the air is sucked into the printer and gets exhausted through the filtration system, then it can be directed to the ventilation pipes, to avoid getting air out of the printer to the room.

Blowing air back to the cabin could cause drafts that can influence the print, and thus cause warping.

Optional filtration unit design error?

simmania — Fri, 06 Feb 2026 20:41:37 +0000

I ordered a Core One L. I want to print big ASA objects and I want to do this safe. So I ordered it with the extra filtration unit.
But studying things a bit further I'm very concerned about the way the filtration unit works. It sucks air out of the printer chamber through the filters. So far so good. But it blows this air into the environment. This means new air needs to enter the printer chamber in some way.
But I read that people that use the printer for ASA printing close all little holes so that the chamber temperature can reach the 50-60 degrees, which is needed for ASA. No new air can go into the printer -> filter does not do its job.

So using the filter and reaching a chamber temperature for ASA don't go together. How can we solve this?
Wouldn't it be better when the filtration units blows the filtered air back into the cabin? How could we achieve this?