Filament Drying Time Calculator

Most 3D printing filaments are hygroscopic, meaning they absorb moisture from the air over time. Wet filament causes a range of printing problems including stringing, bubbling, poor layer adhesion, rough surface finish, and reduced mechanical strength. Drying filament before use is essential for consistent, high-quality prints.

Different filament types absorb moisture at different rates and require different drying temperatures. PLA is mildly hygroscopic and can usually tolerate moderate moisture levels. PETG absorbs moisture faster than PLA and shows more obvious printing defects when wet. ABS is moderately hygroscopic. Nylon is extremely hygroscopic and can absorb several percent of its weight in water within hours of exposure to humid air. TPU (flexible filament) also absorbs moisture readily. ASA behaves similarly to ABS. Polycarbonate (PC) is highly sensitive to moisture and requires thorough drying.

The drying temperature must be high enough to drive moisture out of the filament but low enough to avoid softening or deforming the material. PLA has a low glass transition temperature around 60 degrees Celsius (140 degrees Fahrenheit), so it must be dried at 40 to 50 degrees Celsius (104 to 122 degrees Fahrenheit). PETG can handle 60 to 65 degrees Celsius (140 to 149 degrees Fahrenheit). ABS and ASA can be dried at 70 to 80 degrees Celsius (158 to 176 degrees Fahrenheit). Nylon requires 70 to 80 degrees Celsius. TPU should be dried at 50 to 60 degrees Celsius (122 to 140 degrees Fahrenheit). Polycarbonate can handle 80 to 90 degrees Celsius (176 to 194 degrees Fahrenheit).

Drying time depends on how saturated the filament is and the drying method used. A food dehydrator is the most common budget option and works well, though it may have uneven heat distribution. A conventional kitchen oven can work but temperature accuracy is often poor, and overshooting by even 10 degrees can ruin a spool. A dedicated filament dryer is the best option, offering precise temperature control and sometimes active airflow.

Typical drying times range from 2 hours for lightly damp PLA to 12 or more hours for heavily saturated nylon. As a general rule, it is better to dry longer at a safe temperature than to increase the temperature to speed things up. Many experienced printers dry their nylon overnight (8 to 12 hours) as standard practice.

After drying, store filament in sealed containers with desiccant packets to prevent re-absorption. Vacuum-sealed bags with silica gel are ideal for long-term storage.