I keep my filament in a Sterilight box with one of these. Works great for me. But I am still very new to the hobby.
Once your filament is dry, that will work for a very long time to keep it that way. I do the same with mesh bags of desiccant beads in a Sterilight style box - the one with the blue gasket seal, and the six snap down handles.
I am thinking about custom designing my own filament drier.
This came about as I I run two datacenter level storage servers and they generate quite an amount of heat. I was thinking of directing this heat into a “dry box” which would contain all of my hygroscopic filaments on a set of rollers which will be constantly rotating ( no hot spots ), there will also be a small de humidifier in this dry box.
I was also thinking about making it so if you wanted to use a particular filament there would be a lever which mechanically removes the filament from the rotation cycle and you can then open the box feed the filament through a Bowden tube connector on the back after uncapping it and run the filament directly to the printer.
When finished reverse the process.
Sub plans would be to also have a small micro controller which could watch the humidity and control my air conditioner and the de humidifier as required and maybe even a quarts heater bar in there if it does not get hot enough for the filaments.
Sound like a reasonable idea or am I taking things just a bit to far?
And another thought crossed my mind just as I finished this post, in stead of the filament doing a complete rotation it could rotate 1/2 way and then back again this would still allow for much more even drying but would also allow for the filaments to be kept capped in the bowden tubes ready to feed through immediately after pulling the leaver.
And Ive just figured out how - now its just a matter of if I have the mechanical expertise to pull it off.
A dry box which is constantly moving the filament wheels so there are no hot spots while it allows for direct feed of filament out…
Either food dehydrator or Sovol SH02 Filament Dryer, because they are both cheap enough.
I like that idea too. You might like the the Eibos Polyphemus then. So far it’s the only one I know of that has that feature, though I don’t own it, so I can’t comment on how well the overall machine works.
And then there’s this, the Sunlu E2, which is the latest entry into the higher-end category of filament dryers:
It appears to be more capable and feature rich that the other off-the-shelf products, as well as considerably more expensive. But as a filament vendor, presumably Sunlu foresees a need in the market that justifies the price.
Anything from SUNLU was a great choice tbh just pick one depending on what size you need
I got the SUNLU S2 recently and its been working perfectly, super easy to use and efficient. A nice perk not mentioned a lot is a PTFE tube fits perfectly in the holes for filament coming out of the dryer, so you can keep drying the filament during a print. Haven’t tested to see how well it seals but since there is no o-ring on the lid I cannot image it seals very good.
I ordered the new Sunlu E2. It’s due to ship to me in March. I can’t wait.
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I use two of the CREALITY Official Space Pi Filament Dryers. They work good and are reliable after about 6 months of use. Once filaments are dried, they go in the AMS with desiccant and stay dry.
SUNLU FilaDryer S4 Black is such a solid pick! Keeps the filament dry and ready to go, no more annoying stringing or weird bubbles in prints. Plus, it’s super easy to use. You’ll love it!
I just bought the Sunlu S4.
The only problem I am seeing here is that lets you bulk treat one type of filament not treat multiple types in the same box, I was thinking separated with each having its own temperature controlled environment and bake time based on the material.
But for that you would have to have a compartment & heater for each filament. Also the timer module would have to be able to control each filament.
You might as well buy individual dryers.
This may or may not be a silly question but why not use an air fryer set at 50 degrees for as long as needed to achieve a dry spool?? I haven’t seen this mentioned yet.
I do, I use this
Thanks for the reply Simon14, I couldn’t see any reason why not…!! It is temperature controlled and the air circulates throughout so I just seems logical that it can be used effectively. 
Depends on the air fryer. How uniform is the temperature in the fry chamber? How wide is the temperature hysteresis? Most likely you won’t find that information on the box or in he manual. Most likely you’ need to measure it yourself.
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Ich habe einen Sunlu S2. aber benutzt habe ich ihn erst einmal. Ich hatte einen PETG rest von meinen Arbeitskollegen bekommen der nicht eingepackt war. Ansonsten habe ich meine PLA und PETG-Filamente so gedruckt wie ich sie geleifert bekommen habe. und bisher noch keine Probleme gehabt
Gruss der Garfield
I have a Sunlu S2, but I’ve only used it once. I had received a PETG remnant from my work colleague which was not packed. Apart from that, I have printed my PLA and PETG filaments as I received them and haven’t had any problems so far
Greetings from Garfield
Translated with DeepL
True, but from some of the reviews of the commercial dryers I have read the same could be said about them too…