I like the conceptual idea of "drying on the fly" very much, but I have the same doubts as Ishy.
Normally people recommend to dry plastic for at least *several hours*, preferably in the presence of desiccant (to remove the dislodged moisture). My printer usually consumes about 1m of filament per hour. So a heater would have to be 2 to 3 meters long to meet that spec, and it would need to have escape-routes for the moisture.
So I am not saying this can't work, I hope it does, but I do have doubts. Also, this seems to be only for 1.75mm.
Along the same line of thinking: in the chemical industry they have heater systems for heating thin pipes and sensor lines with fluids, so they do not freeze in winter. These sort of "socks" do encapsulate the pipes. Maybe you could have a look into such systems, and try to adapt one? Maybe then you could make a longer one? And at places cut holes to allow moist air out and fresh air in? Not sure if that would work either, but it could be an interesting experiment?
Not seen that before but looks neat. Can't help wondering if the exposure time is enough to completely dry the filament though.
Also been looking at food dehydrators which seem to be an option. For now I'm running a dehumidifier in my print room which is relatively small.
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