Please note that if an external filtration option is used, like the Smoke Purifier, the chamber temperature can raise high enough that it can lead to clogs due to heat creep (in the extruder or the hotend).
Our team is investigating the idea of using the included filter for PLA, but if it will be implemented, the exhaust fan will probably need to be used at the highest speed to prevent such heat creep issue.
We are still testing to ensure it is a viable solution.