I don’t have FB, maybe you can copy out the informative lines, please?
In the meantime I have also tested back and forth and have another filter that sits on the back of the metal plate. I came across a study that deals with fine dust emissions during 3D printing.
In addition to the bad odors, fine dust emissions are now also filtered out. I left out the carbon package and inserted an air duct at this point instead. The air flow is now much better.
I think if the carbon package was closer to the fan, the airflow could be better. I also thought about constructing a carbon box for it, but it felt like you had to dismantle the whole printer to install it and I was too lazy to do that
My current solution is a compromise of these considerations and it works. I’m also torn between leaving the carbon box out permanently, as this box from BBL minimizes the odours, but doesn’t remove them completely.
In combination with my HEPA filter, no more odors come out the back. If you want to take a look, you can see my construction on Makerworld.
I won’t remove the mesh even if it is at the back.
It sucks the air into the printer. I have a fogger and you can clearly see that the air is being sucked into the printer from the outside. To be honest, I don’t find this funny at all, because it’s basically a really serious defect. Why would you buy a printer with a closed installation space and a carbon filter if it doesn’t filter the particles at all?
@sikoprint
Hi,
As we have already established, air is only drawn in at the edges, i.e. the outer edge of the housing fan. The flow is therefore not optimal, but if you introduce smoke or steam inside the printer above the carbon filter, you will also see the gases being extracted.
If this is not enough for you, take a look at the Makerworld link I sent above.
Hi All,
I’m considering purchasing the P1S and I’m finding out about the filters.
I therefore read this discussion and I ask myself: isn’t it correct for it to suck air from that fan (the one in the videos you published) and then exit from the grills where the activated carbons are?
I’m in the process of installing a duct to the outdoors through a window, and I had the same initial confusion this thread discusses. It looks like your HEPA filter attachment on Makerworld takes into account fixing an additional factor that I didn’t see specified above:
The grated vent that the fan blows through is too wide. It extends past the edge of the fan and exposes the areas where the screws are that hold the fan in place. Seeing that the carbon filter resists air flow, these gaps around the fan’s edges are allowing a bypass for the air to flow back in. The air blows out with the fan, and then is sucked back in where the screws are, flows around the edge of the fan, and then blows back out again. I believe this bypass loop decreases the overall flow of air out of the printer.
As I plan to run this through a duct outdoors instead of using a HEPA filter, I’ve put some electrical tape over the areas where it extends past the fan for now. Thanks for the discussion on here!
well, good thing you have the tool for fixing a new shroud right there on your desks!
fixing the airflow so it runs proprely, either by replacing the fan with something that has a higher static pressure or adjusting the flow ratios will probably reduce noise as well.
I’m working on the exhaust system for my P1S and came across this thread, which got me experimenting. I also noticed that my fan seems to alternate between sucking air in and blowing air out. At one point, I could have sworn it was blowing air, but now it seems to be doing both depending on the situation.
Here’s what I discovered:
When the internal fan is on, the exhaust fan sucks air in.
When the internal fan is off, the exhaust fan blows air out.
I was able to replicate this consistently by manually toggling the fans on and off.
You can control the internal fan using G-code under the filament settings. Once you disable the internal fan in the code, the external fan will always blow air out.
