Drying Filament Properly — Methods, Times, and Temperatures
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Wet filament causes: bubbling, stringing, poor layer adhesion, rough surface texture, and snapping. Drying is often the fix before you blame settings.
Signs of Wet Filament
- Popping or crackling sounds during printing
- Bubbles or rough texture on extruded strands
- Excessive stringing that doesn't respond to retraction tuning
- Inconsistent extrusion
- Filament snapping while feeding
Drying Temperatures and Times
| Material | Temp | Time |
|---|---|---|
| PLA / PLA+ | 45–50°C | 4–6 hrs |
| PETG | 65°C | 6–8 hrs |
| TPU | 50°C | 4–6 hrs |
| ABS / ASA | 80°C | 4–6 hrs |
| PA / Nylon | 80°C | 12–24 hrs |
| PVA | 45°C | 8–12 hrs |
| PC | 80°C | 8–12 hrs |
Caution: Too high = deform the spool. PLA above 55°C risks softening. Always verify spool material rating.
Drying Methods
Food dehydrator — Best option. Consistent temp, fits multiple spools.
Filament dryer (eSun, Sunlu, PrintDry) — Designed for the job. Can print directly from the dryer.
Oven — Works but risky. Most ovens fluctuate ±20°C. Check calibration with a thermometer first.
Not recommended: Microwave, instant pot, air fryer (uneven heating).
Storage After Drying
- Sealed bags with desiccant (silica gel packets)
- Vacuum seal bags are better — less air = less moisture exposure
- Airtight containers with desiccant
- Recharge desiccant in oven at 120°C for 2 hours when saturated (color-change type tells you when)
Hygroscopic Materials Ranked
Most to least moisture-sensitive:
- PA/Nylon (absorbs in hours)
- PVA (absorbs in minutes when open)
- TPU
- PETG
- ABS/ASA
- PLA (relatively stable but still benefits from drying)