How do I know if my filament is wet?

Signs include popping or crackling sounds during printing, excessive stringing, poor surface finish, and visible steam from the nozzle. Nylon and TPU absorb moisture fastest and may show symptoms within hours of exposure.

Can I use a kitchen oven to dry filament?

Yes, but with caution. Most kitchen ovens are inaccurate at low temperatures and can overshoot by 10-20°C. Always use an oven thermometer. PLA especially can warp if the temperature exceeds 50°C. A food dehydrator gives more consistent, safer results.

How long does dried filament stay dry?

It depends on ambient humidity and the material. In a sealed container with desiccant, filament can stay dry for months. Nylon left in the open can absorb enough moisture to cause problems within 24 hours.

Does PLA absorb much moisture?

PLA is less hygroscopic than Nylon or TPU but still absorbs moisture over time. After several weeks in humid conditions, PLA will print noticeably worse. Drying at 45°C for 4 hours restores it.

3DPrintCalcs

Filament Moisture & Dry Time Calculator

Calculate drying temperature, time and storage recommendations for your filament.

Filament TypeHygroscopic materials (Nylon, TPU, PC) need higher temperatures and longer times than PLA

Current ConditionHow long the spool has been exposed to air since opening

Ambient Humidity

Relative humidity of your room. Higher RH lengthens drying and shortens open-air dry-life

Spool Weight

Filament-only weight (typical 1 kg spool of plastic, excluding the reel)

How We Calculate This

Drying Recommendations

Dry temperature is set per material to stay safely below its glass transition (PLA 45°C, PETG 65°C, ABS/ASA 80°C, PC 85°C, Nylon 75°C)
Dry time = Base time x Condition multiplier x Humidity factor
Condition multipliers: New sealed (0.25x), Recently opened (1x), Out for weeks (1.5x), Visible moisture (2x)
Humidity factor stretches the cycle when the room air is damp (1.0x at 50% RH, up to 1.6x in very humid conditions)
Storage target is lower for highly hygroscopic materials (<10% RH for Nylon/TPU/PC, <20% for PLA)
Open-air dry-life estimates how long the dried spool stays usable out of storage at your humidity — days for PLA, hours for Nylon

Always store dried filament in airtight containers with silica gel desiccant. Vacuum-sealed bags work well for long-term storage.

Frequently Asked Questions

Related Calculators

PLA vs PETG Calculator

Compare PLA and PETG properties side by side for your specific use case.

Material Strength Calculator

Estimate tensile and compressive strength based on material and print orientation.

Heat Resistance Calculator

Check if your printed part will withstand a given operating temperature.

Flexibility Calculator

Calculate shore hardness and flex properties for TPU and flexible filaments.

Material Weight Calculator

Calculate the weight of a printed part from its volume and material density.

Last updated: March 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.