I came across this interesting article about drying filament while it is being printed.
Here are the currently available inline filament dryers available on the market:
The one below is extremely overpriced
That would be a game changer for sure
That’s a very interesting idea and makes complete sense. And he is right about spools of filament not being especially dryer friendly. With a funnel-like exit an AMS might even be able to feed filament through an inline dryer. Diameter could be much smaller - just a bit bigger than the filament. Only thing is you probably can’t shorten it up too much without more heat or slowing down printing to give more time in the dryer. But really cool! 
I looked at some video reviews and it seems like these dryers don’t dry fast enough to be useful inline. And the tests I saw were for slower printers so it probably would have even less effect when used with Bambu.
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They’re stupid expensive. There’s a vid somewhere on YouTube where a dude made something similar with tin cans and a heater.
I don’t know the specifics but a wild guess (and it’s a guess) I feel like this would be inefficient.
The article above links to the video you are talking about
Thanks. I have my thoughts but need more info. Energy consumption, times, space, parts cost.
Will wait and see.
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You would have to have a long enough heating tube so it has enough time to dry the filament, but if the tube is too long it might take up too much space or the printer might have issues pulling the filament.
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I agree. The S4 currently does a good job both storing and drying filament for me. Feeding from it (TPU & abrasives) has been easy enough. Leads me to wonder why reinvent the wheel?
I agree that deeper into the filament takes longer to dry, and for some it could be a problem. It’s just one I personally haven’t seen a huge need of a solution. Perhaps in farm settings or industrial, with the tech trickling down eventually to enthusiasts making it smaller and simpler.
TPU isn’t abrasive, it is just too soft for the mechanism in the AMS.
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I’ve been using the Thorsden for a couple of months now. The results have been impressive with PLA, PETG, ABS and ASA. Haven’t used it with anything else. Live in AL so humidity is just stupid. Once dialed in it removes an impressive amount on moisture very quickly. With it positioned after my hub, I’m getting to use my AMSs without hours of predrying and silica swapping. The one caveat I have made was to print a calibration cube when starting, so that the filament for the first layer, of the actual print, has had a slow trip through the dryer.
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No affiliation, just my experience.
yeah i just realized I typed that.
was supposed to be “as well as abrasives”.
my bad.
Where can i get the Thordsen IFD-175 in EU?
They don’t ship outside of US/CA…