Why Dry Your Filament?
Most 3D printing filaments are hygroscopic — they absorb moisture from the air. Wet filament causes stringing, bubbling, poor layer adhesion, and surface defects. Drying restores print quality.
Signs of Wet Filament
- Popping or crackling sounds during printing
- Excessive stringing between parts
- Rough, bubbly, or pitted surface finish
- Poor layer adhesion and weak parts
- Oozing at the nozzle during travel moves
Drying Methods
- Filament dryer (recommended): Purpose-built, most reliable. 4-12+ hours.
- Food dehydrator: Affordable alternative. Ensure it reaches the required temperature.
- Oven (caution): Set 5-10°C below target — ovens are often inaccurate and can melt filament.
- Dry box with desiccant: For storage/prevention, not active drying.
Prevention Tips
- Store filament in sealed bags with desiccant packets
- Use a dry box while printing (especially for Nylon, TPU, PVA)
- Vacuum-sealed bags are the gold standard for long-term storage