Dry Filaments

How it works

After absorbing moisture from the air, the water molecules are bound to the polymer chains of filaments.  The PrintDry filament dryer uses heat to cause the molecules in the filament to move more vigorously and this weakens and breaks the bond of water molecules from the polymer chains and permits water molecules to move freely.  Airflow carries heat to the filament and also carries the freed water molecules away.  However, filaments  do not dry instantly.  They must first be heated to allow the water molecules free movement.  Then, there must be sufficient time for the water molecules to defuse to the surface of the filament in order to evaporate.  The PrintDry filament dryer is designed based on these drying factors: (1) heat; (2) dew point; (3) drying time; (4) airflow.  (click here for the science behind it)          


Same filament with different moisture content can make a big difference in the quality of your prints.  (pictures from eurekadrytech.com)



A spool of filament can be dried in a PrintDry filament dryer before 3D printing for storage.  The dryer temperature can be set in a range of 35-70°C or 95-160°F.


Relative humidity inside the PrintDry filament dryer can go as low as 10% after 2-hour drying.


To dry multiple spools of filaments as well as to regenerate desiccant packs are also possible.


How to store filaments after drying? Click Here .

Recommended Drying Time
No. Materials Dryer Temp Drying Time
1 PLA 45°C (113°F) > 4h
2 ABS 60°C (140°F) > 2h
3 PETG 65°C (149°F) > 2h
4 Nylon 70°C (158°F) > 12h
5 Dessicant 65°C (149°F) > 3h
6 PVA 45°C (113°F) > 4h
7 TPU/TPE 50°C (122°F) > 4h
8 ASA 60°C (140°F) > 4h
9 PP 55°C (131°F) > 6h

These recommendations are made for the following conditions.   

* Ambient RH: 50%     * Ambient Temp: 20°C (68°F)     * 500g (1 lbs) filament spool

Actual drying time for a filament may vary under different environmental conditions as well as the initial water content levels in the filament.  In addition to drying prior to 3D printing, drying the filament while printing is always recommended.