Comgrow3D Printer Filament Dryer Box, Comgrow 3D Filament Storages, Keeping Filaments Dry During 3D Printing, Compatible with 1.75mm/2.85mm PLA ABS Material, Filament Dehydrator, Spool Holder

This dryer actually looks and feels well made and works great too. Please read the instructions for operation, it's not very intuitive, but not too complex to learn either. Makes a decent seal and can hold moisture out for a few days even off. I like that it displays time, temp and humidity when it's working. No issues holding 2 filament spools with some room to spare on sides, so no issues if you were to use the spool holes to hold filament-ends (sticking out a bit on sides). Has closable feed-holes on top and front if you wanted to feed up/forward while keeping rest of spool dry. I've accidentally dropped it, from about a 30" high (table) onto lush carpet and luckily nothing broke.

Bought this filament dryer to see if I could save an older roll of PLA filament that had become very brittle. Very impressed with the packaging, very well padded. Two rolls of filament fit fine. Controls are not the most intuitive but easy to understand after reading the simple manual. Ran the dryer for 8 hours and seems like the filament is no longer brittle. I have not had a chance to use the filament yet but so far this looks promising.

Overall I am pleased, but I want to share how this performs.First off, the design changed a little from the pictures, it now has four holes for filament to feed through. Two on the top , as shown, and now two more on the front. All of the holes have silicone seals to close them off, so this is an improvement.Now for the results of my testing. I put a hygrometer inside the case and graphed the results. The unit dries the filament very slowly, so if you have filament that is very moist, you’ll likely need to run this for days to dry it. I averaged around 0.6 to 0.7% per hour (takes about 4 hours before it starts dropping). So it’s slow and steady, which is not a bad thing. Once you have it fairly dry, it will start absorbing moisture again (even if you don’t open the case).In my tests, once the drying cycle completes, the humidity inside the enclosure will start to gradually increase again. Slower than the drying cycle, but steadily increasing. The case has no openings except for filament holes (plugged for testing) and the joint between the base and lid. The drying is accomplished by heating and a small fan that just circulates the air inside the case (it is not vented to the room). So for the humidity to drop the moisture has to be seeping through the joint between the base and the lid. So when the cycle stops, the reverse starts to occur.Final thoughts: I am not pointing this out as a flaw (I still gave it 5 stars), but rather to help others to understand how the device works/behaves. So now I know that the device will need to be run periodically to maintain the target moisture level in the filament AND that the dryer itself is not a good long term storage box. Once filament is dry and won’t be used for a while, it should be stored in something that is air tight to maintain the proper moisture levels.

Thing does it's job nice and dry also great smell! But honestly them buttons are really the biggest downfall. There's not a lot of ummm things there yaknoww like there could be a lot more options or better freaking controls. Only thing missing that 5! Overall pick this thing up I'll buy 5 more definitely harder to recommend

My first filament dryer i chose because it was cheap. Honestly cant really say much other than i had a transparent filament that was giving me problems. I put it in the dryer for 6 hours and it has printed flawlessly for the entire roll. It works and does it job.

Was initially underwhelmed by this Filament Dryer, but now that i'v been using it for a while, it has done a remarkable job at drying out all of my PLA and PETG and even silica packets that i recharge in it sometimes. The max temp is 50c, and I know some people say you NEED hotter for PETG, but after using this to dry out many spools of PETG now, I can confidently say that this dryer does the job quite well. Water is water, dry it overnight and it all drys away.Just remember to crack open the lid every now and then to let out the "wet" heated air, and don't leave too big of a gap, iv learned that somewhere between half an inch to less than half is the sweet spot.One thing i'v noticed is that the external power brick also gets quite hot, and i'v been tempted to screw it right onto the dryer, to use some of its heat, but i'm no electrician and im sure they separated the power brick for a good reason.