Filament is surprisingly sensitive to moisture — and Utah's variable humidity (dry desert in summer, wetter in winter and at elevation) means you can't just leave spools on a shelf and forget about them. Wet filament causes stringing, bubbling, weak layer adhesion, and failed prints. Here's everything you need to know to keep your filament dry and performing at its best.
Why Moisture Destroys Filament
Plastics used in 3D printing — especially PLA, PETG, Nylon, and TPU — are hygroscopic, meaning they absorb water from the air. Once absorbed, that moisture turns to steam during printing at high temperatures. You'll see:
- Popping or crackling sounds from the nozzle
- Excessive stringing and oozing
- Surface bubbles and rough layer texture
- Reduced part strength due to poor layer bonding
- Color inconsistency, especially with translucent or silk materials
ABS and ASA are relatively less sensitive. PLA absorbs moisture slowly. PETG is more sensitive. Nylon and TPU are the worst — they can go bad in a few hours of open-air exposure.
How to Store Filament Correctly
1. Airtight Containers with Desiccant
The gold standard is storing each spool in a sealed container with fresh desiccant. Options:
- Vacuum-seal bags — cheap, effective, easy to find at Walmart or Amazon
- Airtight plastic bins (like IRIS or Sterilite) with 1–2 silica gel packets per spool
- Dedicated filament dry boxes (eSUN eBox, PrintDry) — these store and feed filament while keeping it dry
Silica gel packets turn pink when saturated — you can recharge them by baking in an oven at 250°F (120°C) for 2–3 hours and reuse them indefinitely.
2. Know Your Filament Sensitivity
| Material | Moisture Sensitivity | Open Air Shelf Life |
|---|---|---|
| PLA | Low–Medium | Weeks to months |
| PETG | Medium | Days to weeks |
| ABS / ASA | Low | Months |
| TPU / Flex | High | Hours to days |
| Nylon (PA) | Very High | Hours |
3. Don't Forget About Temperature
Most filaments are stable at room temperature (60–80°F). Avoid storing in garages that hit 100°F+ in Utah summers — PLA can soften and warp on the spool. Cold is generally fine for most materials, though condensation when moving filament from cold to warm environments can introduce moisture quickly. Let cold filament reach room temperature before opening.
How to Dry Wet Filament
If your filament is already wet, you can often rescue it:
- Food dehydrator: The easiest and cheapest option. Set to ~45°C (113°F) for PLA, ~55°C for PETG/TPU, ~70°C for Nylon. Run for 4–8 hours.
- Oven: Use a low oven at ~50°C (122°F). Most ovens don't go that low — check your actual temperature with an oven thermometer. Don't exceed PLA's softening point (~60°C).
- Dedicated filament dryers: PrintDry, eSUN eBox, Sunlu FilaDryer — these are the most consistent option and double as dry storage boxes.
After drying, seal immediately in an airtight container with fresh desiccant and let cool before printing.
How Long Does Filament Last?
Properly sealed with desiccant, most filaments last 1–3 years or longer. Forgely Performance PLA is sealed in airtight bags from the factory — keep it sealed until you're ready to use it, then reseal between sessions.
Questions? Come See Us
We stock Forgely Performance PLA in 30+ colors, always fresh. If your filament is acting up — stringing, popping, weak prints — bring it in and we'll test it. Often it's a moisture issue, not a printer problem.
📍 Forgely Roy — 5519 S 1900 W, Roy, UT 84067
📞 385-449-2694
⏰ Mon–Fri 11–6 • Sat 11–3
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