How to Store and Dry 3D Printing Filament
Moisture is the silent killer of print quality. Learn how to store filament properly, recognize wet filament, and dry it back to perfect condition — with drying temperatures and times for every material.
If your prints have become suddenly rough, stringy, or full of bubbles — and you haven't changed any settings — wet filament is the most likely culprit. Most printing problems that people spend hours troubleshooting are simply caused by moisture-contaminated filament.
Why Moisture Destroys Print Quality
Most 3D printing filaments are hygroscopic — they absorb moisture from the air. When wet filament is heated in the nozzle, that moisture instantly vaporizes into steam. The result is:
- Popping, crackling, or hissing sounds from the nozzle
- Rough, bubbly surface texture (tiny craters from steam escaping)
- Excessive stringing
- Inconsistent extrusion and weak layer adhesion
Which Materials Are Most Affected?
| Material | Moisture Sensitivity | Notes |
|---|---|---|
| Nylon (PA) | Extreme | Can absorb 3%+ of its weight in hours |
| PVA | Extreme | Absorbs so fast it becomes unusable |
| PC | Very High | Must be dried before every use |
| ABS | High | Often mistaken for temp issues |
| ASA | High | Same as ABS |
| PETG | Moderate-High | Very common source of stringing |
| TPU | Moderate | Strings excessively when wet |
| PLA | Low-Moderate | Takes longer to absorb |
How to Recognize Wet Filament
During printing:
- Popping, crackling, or hissing from the nozzle
- Steam or wisps of vapor from the nozzle
- Extrusion that looks foamy or rough
On finished prints:
- Rough, pitted, or bubbly surface texture
- Stringing much worse than usual
- Transparent filament appears yellowed or cloudy
On the spool:
- Nylon that snaps when bent (dry Nylon is flexible — wet Nylon is brittle)
How to Dry Filament
Recommended Temperatures and Times
| Material | Temperature | Time |
|---|---|---|
| PLA | 45–50°C | 4–6 hours |
| PLA+ | 50–55°C | 4–6 hours |
| PETG | 65–70°C | 4–6 hours |
| ABS | 65–80°C | 4–6 hours |
| ASA | 65–80°C | 4–6 hours |
| TPU (95A) | 50–55°C | 4–6 hours |
| Nylon (PA6) | 80°C | 8–12 hours |
| Nylon (PA12) | 70°C | 6–8 hours |
| PC | 80–90°C | 8–12 hours |
Do not exceed the glass transition temperature of the filament — PLA is the most sensitive, keep it at 45–50°C maximum.
Drying Methods
Dedicated filament dryer (recommended): Products like the Sunlu Filadryer S2 or eSUN eBOX have accurate temperature controls. Cost: $30–80.
Food dehydrator: An excellent cheap option with accurate temperature control for most materials.
Kitchen oven: Works in a pinch but most ovens are inaccurate at low temps. Use an oven thermometer.
How to Store Filament
Vacuum bags with desiccant: The cheapest and most effective storage. One 50g silica gel packet per spool. Recharge desiccant in the oven at 120°C for 2–3 hours.
Airtight containers: Storage totes with gasket lids (like Sistema or Iris boxes) work well for multiple spools.
Dedicated dry boxes: Products like the eSUN eBOX or Sunlu Filadryer let you store and print from a sealed heated environment — the best solution for Nylon and PC.
Priority for dry storage:
- Nylon, PVA, PC — store immediately in dry box or vacuum bag
- PETG, ABS, ASA, TPU — seal with desiccant between uses
- PLA — seal when storing long-term
Quick Checklist
- Store all filament in sealed containers with desiccant when not in use
- Dry Nylon, PC, and ABS before every use if stored open
- Listen for popping/crackling — that's your early warning sign
- Recharge desiccant packets before they saturate
See our Settings database for material-specific drying recommendations alongside print profiles.