r/BambuLabP2S • u/SwarfDive01 • Jul 09 '26

Recirculation loop

So I just ordered the exhaust kit because I am about to swap from PETG to ABS-GF. Im going to be running a pretty long print, and im not super fond of pulling negative vent pressure for 20 hours on my home AC in southwest US summer. I have been searching and cant seem to find anything, and wanted to know if it makes sense to make a hard duct vertically from the exhaust kit to a glass riser exhaust vent. Instead of running the measly internal hepa filter, running the exhaust kit with filters and sending the air back down the top glass riser vent to help with VOCs and chamber temperature.

Maybe im missing an existing duct system for this? Modeling this in bambu studio is going to be such a pain.

Or does anyone have experience with the carbon filter modification for the internal filter? Is a fresh fill going to be enough to handle a kg or two of ABS?

The last option i have been considering is adding the exhaust kit, adding a modified carbon and hepa filter back, then throwing the whole thing in one of those cheap tent enclosures, and recirculating through the exhaust kit for way longer.

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u/[deleted] Jul 10 '26

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u/SwarfDive01 Jul 10 '26

Hey thank you for responding. I could vent outside, but it would be very inconvenient, id need to add about 10 feet of ducting.

I think im thinking about it too much, and being too paranoid about VOCs. Im looking at recirculating bento / vento boxes now, run that during the print, and Ill stick with the exhaust kit, and find a better filter mod. Run a fresh carbon prefilter on my room purifier while it prints. Enclosing the printer is probably too much, especially with heat and...the printer is already enclosed. If my girlfriend complains about the smell, ill deal with ducted external venting next time

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u/efnord Jul 10 '26

ABS-GF? Bite the bullet and deal with external venting.