@glowl @Spark Technically having your printer inside a negative pressure box should always be superior to any filtration, as long as fresh air can freely move in from somewhere else. Of course you could also do both.We're currently exploring the possibility of a tent as well. The printer got a single filter inside the build space (Saturn 3), air is supposed to be sucked out of the apartment from the tent, and a strong room air purifier standing next to it as well since it ain't a separate room.