Almost. Over on a different thread @IslandBill is pursuing essentially that idea, but rather than a once-and-done purge, when that dry air picks up moisture from the filament (for the sake of argument, assume the purge air has 0% RH humidity to start with), you then purge out that newly moistened air and replace it with fresh 0% RH air. And continue cycling like that until it remains bone dry. That’s the theory anyway. He also plans to add heat to help it along that way as well. Because he’s in a humid tropical climate, it can’t rely on only just ambient air for the make-up air, because he has found it too humid for that purpose.