I wonder about the Chamber fan functionality during and after printing. I guess, Bambu Lab is using the fan mainly for cooling the chamber during printing with hotter bed temperature and material with lower softening temperature. Nothing against it.
What I don’t understand ist, why not run the fan for some time after printing e.g. ABS/ASA to get rid of smell and VOC? Additionally, a small amount e.g. 10-20% won’t hurt during a ABS print.
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There’s nothing stopping you from manually turning the chamber fan on after a print.
One thing to note is that BL’s system isn’t very effective as the air only passes through the carbon filter once and then gets expelled into the room, there’s very little reduction in VOC concentration, meaning you still need a well ventilated area for the printer. You could look into building a bento box if you are concerned about the smell or VOCs
You can edit the end gcode
Turn on fan
Wait xx
…
Thank you, great idea! Google says it is something like:
M106 P3 S25 ;Chamber-Fan full on
G4 S 1200 ;Wait 20min
M106 P3 S0 ;Chamber-Fan off
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Thank you, seams like a great idea. I look into it.
That’s what I did for ABS:
In all ABS filament profiles Start G-code:
M106 P3 S25 ; Run chamber fan at 10%
Then I created an ABS profile for the printer and added this at the end of Machine End G-Code:
; ABS Air filtering
M106 P3 S255 ; turn chamber fan 100%
G4 S300 ; wait 5 minutes
M106 P3 S0 ; turn chamber fan off
I just need to remember to use the ABS printer profile when printing ABS.
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I have an ABS print running and I noticed that the Chamber fan is running at 70% during the print but when I look at the settings it is 10% in the box with the + and - but the dial says 70% my chamber temperature is 40°C, is it normal to have the chamber fan at 70%?, this was a 3MF Project downloaded from one of the part libraries so it could have been set by the author.
Does anyone know why this is at 70%?
When the print is finished I will use the end G code to set a profile for extracting the air and VOCs from the chamber.
How about using an external fan to speed up the coling of model and plate after a print is finished? Could that be harmful in any way?
Just be aware that the chamber fan really isn’t great at filtering through that carbon box.
Either exhausts out a window, to an air cleaner, use a Bento Box with the printer closed.
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I’m doing external venting with an additional aux helper fan. No problem so far, and in fact for PLA I guess it’s helpful to keep temps down while keeping the X1 sealed. AFAIK the main concern would be heat loss for things like ABS printing.
Haven’t done much that requires higher temps yet but I’ll probably just have the external fan off for that, and run it for a bit after the print is done.
Basically I’ve got this:
With this inline:
With two of these:
And then you just need some kind of adapter to connect the back. I won’t bother posting that because the one I used was kinda trash and barely fit. But it was something based off one that’s on Bambu’s wiki (it was designed the engineering printer I think so it fits an X1 lousy and needs to be flipped).
Come to think of it, this thread reminds me that I forgot to remove the (now useless) carbon filter! I also have one of those Bento Box things, because I enjoy overkill.
So you’re just wanting to lessen the smell and not filter the VOC out of the air?
Just put a dryer sheet in with the carbon filter. Done.
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I’m confused: here and on some Youtube a tube is attached to the chamber fan in order to extract smells etc.
However on my P1S the default Chamber fan SUCKS air into the printer. So attaching a tube with external fan to extract air seems the wrong way to go.
If your chamber fan sucks in air it was installed back to front… It’s a very easy fix, just take the back panel off
The fan isn’t normally reversed. If you remove the filter it will operate as you expect, exhausting air from the chamber. What I suspect is happening is that the filter creates enough restriction that instead of drawing only air through the filter, there is air that is dawn in between the somewhat large clearance between the fan blades and the outer ring of the fan. This is why you “feel” air being drawn in when it is really just being drawn in out outside edges of the fan and exhausted more towards the center.
That is spot on! I removed the filter an lo and behold the back outlet produced an outward airflow.
Great now I can proceed with the fume extraction.
Thanks for the pointer!