Slice EngineeringFilament Drying Desiccant - Place Inside Spool, Dry Box, Storage Bag, Dryer Box, or Any Filament Storage! - Alumina Desiccants 10x More Powerful Than Silica Gel - 3-Pack

Great

These are absurdly expensive for what they are, but they do work very well.Currently using them in the Bambu Lab AMS and they fit great in the bambu filament rolls. They fit fine in prusament rolls, but are off angle because the inside of the roll is larger than the spool opening.Haven’t tried recharging them yet but i’m sure they’ll do fine.I did have an issue with the top popping off if I dropped it on the table/floor. Easily fixed by taping the lid to the can.

Small containers that do a great job pulling moisture from the air to keep your filament dry.

While the activated alumina is a good desicant, I don't see how it works in this application.I placed a container inside the hole of a Bambu Lab PETG roll, bagged the roll and pulled a vacuum with a small pump. The bag eventually formed over the hole and was pulled inside the hole and formed over the mesh end of the container, practically sealing if. It's like putting the container inside the spool hole with the cap on.I am considering returning this 5 pack. Sorry!UPDATE 02/04/2024I believe I came up with a solution to the problem of the storage bag sealing the mesh opening of the container. I 3D printed a disk featuring a 3mm raised circle with a couple of 3mm ribs inside. The circle's diameter is slightly bigger than the diameter of the filament roll hub. This side of the disk will face the mesh opening and will prevent the bag coming into contact with the mesh sealing off. Now the desiccant container can breathe into the roll hub and from there into the layers of filament. The disk is locked in place when the bag presses against it under vacuum.UPDATE 02/29/2024Three out of the five containers have caps that pop off easily. They do not attach well. When putting on a cap and tightening, the dimple is supposed to stop at the end of the groove. For these 3 containers, the dimples just go past and around. Feels like very poor quality. I'll try a replacement before returning for refund.

These are awesome. They work great and definitely keep the humidity in check in my filament bags. I really like that they are infinitely reusable as I’m not a fan of one time use consumables when I can get away from them.The moisture indicating strips that come with them are junk. they are all over the place so I threw them out and manage humidity with a hygrometer.They are definitely a bit pricey and I have had them not fit in one of my filament spools but overall I’m really happy with them.