Filament Dryers and Dry Boxes: Start Here
An active dryer uses controlled heat to remove moisture; a dry box keeps already-dry filament dry. They solve different problems. Buy based on the materials you print, the spools you use, and what their manufacturers recommend.
Where to go next
What matters most
Dry vs store
A sealed box with desiccant limits moisture exposure but will not restore wet filament. Prusa's drying guidance and Bambu Lab's drying recommendations both distinguish drying from storage.
Temperature and spool limits
Drying temperatures differ by material and grade, and spools have their own temperature limits. Bambu Lab notes third-party spools can deform. Follow the filament, spool, and dryer manufacturers' guidance.
Capacity and spool size
Check the dryer's internal dimensions against your spools, including cardboard spools and larger formats.
Printing from the dryer
Some units feed filament while drying. Check the feed path suits your printer, especially for flexible filament.
Check before you buy
- Which materials do you print, and what drying guidance does each maker give?
- Do your spools fit, and are they rated for the temperature?
- Does the dryer hold the temperature your materials need without exceeding spool limits?
- Do you need to print directly from it?
Sources
- Drying filament, Prusa Research
- Filament drying recommendations, Bambu Lab