This looks like something I would like to test. To check local availability, could you please share a type of HEPA filter and size of carbon pellets you used?
Prusa Core One Carbon filter Active magnetic
Slim 46 mm carbon + HEPA filter for Prusa Core One with long 8–16 cm airflow path and triple 4020 fans.
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@dwbmb i bought carbon pellet in pet shop for aquarium filter. Very cheap for 1kg
Any Hepa filter you can buy in your neighborhood warehouse store. And you cut it so its fut i side.