Filament Storage Guide: Keep Your Filament Dry
Moisture ruins filament and prints. Learn proper storage techniques, drying methods, and when filament needs replacing.
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Take Our QuizIs your filament popping and crackling during prints? That's moisture. Humidity wrecks filament, and most makers don't realize it's a problem until their print quality tanks.
Why Moisture Matters Most filaments absorb water from the air (hygroscopic). Absorbed moisture vaporizes during printing, causing: - Popping and hissing sounds - Stringing and poor surface finish - Weak layer adhesion - Brittle prints - Inconsistent extrusion
Some materials are worse than others. Nylon absorbs moisture in hours. PETG takes days. PLA takes weeks but still absorbs eventually.
Material Sensitivity High sensitivity (store sealed always): Nylon, TPU, PETG, polycarbonate Medium sensitivity (seal after opening): PLA, ABS, ASA Lower sensitivity (but still benefits): PETG when new
If you're not sure, treat it as sensitive. Better over-protected than ruined.
Storage Solutions
Budget: Vacuum bags with silica gel (around $10-15) Resealable vacuum bags work well. Add 50-100g of silica gel per spool. Squeeze out air or use a hand vacuum pump. Effective and cheap.
Mid-range: Sealed containers with desiccant (around $25-40) Plastic storage containers with gasket seals hold multiple spools. Add color-indicating silica gel that changes color when saturated. Bake silica in oven at 250°F to recharge when needed.
Premium: Dry boxes with active drying (around $50-120) Dedicated filament dry boxes maintain low humidity and can feed filament directly to the printer. Worth it for serious users or if you print moisture-sensitive materials regularly.
**Signs Your Filament Is Wet** Listen: Popping, crackling, or hissing during printing indicates moisture vaporizing Look: Excessive stringing, rough surfaces, or steam from nozzle Feel: Brittle filament that snaps instead of bending (especially PLA)
**Drying Wet Filament** Wet filament can be saved. Drying options:
Dedicated filament dryer (around $40-60): The SUNLU Filament Dryer S2 is purpose-built with 360° heating, temperature control, and feeds directly to the printer. You can print while drying. The best solution. *(Price when reviewed: ~$50 | View on Amazon)*
Food dehydrator (around $30-50): Works well at low temperature settings. Ensure it reaches required temperatures.
Oven: Works but risky. Most ovens can't hold accurate low temperatures. Overheating damages filament. Not recommended unless you verify temperature with a thermometer.
Drying times: PLA: 113-122°F for 4-6 hours PETG: 149°F for 4-6 hours Nylon: 158-176°F for 12+ hours TPU: 122°F for 4-6 hours
Humidity by Region If you're in the Southeast, Gulf Coast, or Pacific Northwest, humidity is a year-round concern. Desert states like Arizona and Nevada get a break, but air conditioning can still introduce moisture indoors.
Summer everywhere: Higher humidity, more attention needed Winter with heating: Indoor air is drier, less urgent Basements and garages: Often more humid than living spaces
A cheap hygrometer (around $8-12) in your storage container tells you if your solution works. Target under 20% RH inside sealed storage.
Workflow Tips Keep only your current spool on the printer. Return spools to sealed storage when switching.
Don't leave spools out overnight. Even a few hours in humid conditions affects sensitive materials.
Date your filament. First-in-first-out prevents old spools degrading in storage.
Throw away badly degraded filament. If prints consistently fail despite drying, the damage may be permanent.
Prevention Beats Cure Drying filament works, but prevention is better. Seal new filament immediately after opening. Store opened spools properly. Check storage humidity periodically. Consistent habits mean consistently good prints.
Not sure which filament to buy in the first place? Our PLA vs PETG vs ABS comparison covers the options. And keep your printer running smoothly alongside your filament with our maintenance guide.
Products Mentioned in This Guide
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