DIY Exhaust HEPA + carbon filter for P2S
Hey everyone,
I built a custom external filter for the P2S and wanted to share it with you.
The P2S only uses its built-in filter in the heating mode. For PLA and other materials that prefer a cool chamber the air is basically unfiltered, so I designed a filter box that plugs into the unused left air channel.
Inside are two 40×40 mm fans (I’m currently running two Noctua NF-A4x10 24V PWM which are quiet but not super powerful) pulling air through an 80×40 mm HEPA filter and a carbon cartridge filled with granulate. The fans are connected directly to the P2S mainboard (24 V, 4-pin header), so the filter can be controlled from the printer screen, Bambu Studio or via filament profile / G-Code.
The carbon cartridge is fully removable, and the HEPA sits in the lid with print-in-place latches, so both are easy to replace.
I’ve uploaded all Design (versions for 10/20/28 mm fan height) and a more detailed description here:
Happy to hear your feedback
Posted Dec 5, 2025, 3:20 PM UTC