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Filaments tend to absorb moisture from humid air, with moist filament as a result. The absorption of even small amounts of moisture by filaments during storage and 3D printing degrades final part quality and causes manufacturing problems. 

Moist filament can be dried, however filament drying is a technical challenge due to the combination of plastic characteristics and conditions required for drying. The commonly available filament dryers make use of some form of "warm air drying". Although this approach somewhat reduces the moisture content, it does not eliminate it. Furthermore, the high temperatures required for hot air drying can damage filaments.  By using vacuum filament drying this moisture is completely removed, reducing manufacturing issues, improving part quality and keeping filaments intact and undamaged.

This page provides insight into moisture related problems for 3D printing as well as technical background for filament drying.

Moist filament and 3D Printing

Benefits of vacuum

Warm air drying

Vacuum drying

Vacuum Drying in the Filament Vacuum Dryer


The pictures below show two PLA prints from the same spool. The left one is printed with moist filament and show the effects of moisture. The right one is printed after 3 hours of drying in the Vacuum Filament Dryer. (40°C and 30 mbar absolute) The prints are not post processed in any way and show how they came out of the printer.