CCTREE3D Printer Filament Dryer Box,Filament Dehydrator 3D Printer Spool Holder, Dry Box for Keeping Filament Dry During 3D Printing,Compatible with 1.75mm, 2.85mm, 3.00mm Filament, Storage Box

Works great and price is good

Seems to work fine compared to my esun heater box. They seem to have copied the functionality of the esun box with the 3 temp modes. Just wish it came with a ptfe guide tube.

Just reviewing the two on the right of pic.(the one on the left is a different brand). They are great. Can barely hear it and does the job of drying out the filaments. And ease of use.

First of all, do you really need a filament dryer? In my experience, when the ambient humidity is around 30% (Minnesota winter), it doesn't make much difference. My prints come out mostly ok. However, when summer hit and we start seeing 50%+ ambient humidity, I start to see my print quality decline and it feels brittle. Putting it in this dryer for a night noticably helps. It brings the print quality right back to what I would expect. There's a lot of expensive options out there for dryers, I bought this one because it was cheap, and honestly I don't see any reason to spend more. It does exactly what you need it to do.For long term storage, it's probably not ideal. Especially because you're supposed to dry filament for like 5 hours before printing it, so if this is your only solution, you'll be waiting a while for it to dry. I keep my filament in a gasket seal large plastic bin, with dessicant packets, and a humidity gauge. Inside, it's about 10% humidity.I typically will start a print from some filament out of that box, so that it's ready to go when I want it. If it's a long print and the filament has been out for a day or two, I'll usually dry it with this dryer before putting it back in the plastic box. Or if I know it's going to be a really long print, I'll put it in the dryer while it's printing (it'll print from the dryer box just fine).I was a little annoyed at the eyelet hole design, it's a solid circle, so you have to pull the filament out of the extruder to feed it thru the eyelet on the dryer box if you want to print right from it. Or do what I did, I just snipped off part of that hole so now I can put the filament inside the box without taking it out of the extruder.

The product does not work. It is extremely cheap and does not do what is claimed. Manufacturer suggests my issue with their filaments is moisture and recommends drying. I use their dryer, and no change, so must be their product is junk.