One of the most common issues 3D printer owners face is filament that has absorbed too much moisture. Even if it looks fine on the spool, damp filament can cause stringing, poor layer adhesion, brittle prints, and popping sounds during extrusion. Knowing how to properly store your filament will save you failed prints and wasted material.
Why Moisture Matters in 3D Printing
Most 3D printing filaments are hygroscopic, meaning they naturally absorb water from the air. PLA, PETG, ABS, and especially nylon are all affected. Once moisture gets inside, it expands as the filament is heated in your nozzle, leading to bubbles, weak layers, and surface imperfections.
Tips for Storing Filament
- Keep spools sealed: Always store unused filament in resealable bags with silica gel packs.
- Use airtight containers: Plastic tubs with rubber seals or vacuum-sealed storage bags work well.
- Avoid humid areas: Store filament in a cool, dry place, away from direct sunlight.
Filament Dryers: The Best Way to Protect Your Material
Even with good storage, filament can slowly absorb moisture between prints. That’s where a filament dryer comes in. These devices gently heat the filament to remove moisture before printing, ensuring consistent, high-quality results.
At 3docity, we stock the Sunlu S2 Filament Dryer and the larger Sunlu S4 Filament Dryer. Both are designed to keep your spools dry and ready to use, making them an essential tool for anyone who wants reliable prints every time.
How Long Does Filament Last?
When stored properly, PLA and PETG can last years without issues. Nylon and other specialty filaments are more sensitive and benefit greatly from consistent use of a dryer. If your filament has been sitting out for weeks or months, running it through a Sunlu dryer before printing can make a big difference.
Final Thoughts
Moisture is one of the hidden enemies of 3D printing, but with proper storage and the use of a filament dryer, it’s easy to avoid. Keep your spools sealed, invest in a reliable dryer, and you’ll enjoy smoother prints and fewer failures.
💡 Pro tip: All of our Sunlu PLA filament arrives vacuum-sealed and moisture-free, so you can start printing right out of the box. Pair it with a Sunlu filament dryer for the best long-term results.
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