Why it matters
At 70–85% relative humidity, an open spool starts absorbing moisture within days. Wet filament prints with popping sounds, rough surfaces, stringing and weak layer bonds. PETG and TPU suffer fastest; PLA is slower but not immune. Every TerraEco roll leaves the factory dry — vacuum-sealed with desiccant — so your storage starts from zero moisture, not from already-damp. Wet filament also strings: if you see cobwebs, work the stringing fixes after drying.
The sealed-box method
- Use an airtight container or large ziplock per spool
- Add 100–200g of rechargeable silica gel per box
- Include a cheap hygrometer — recharge desiccant when RH climbs past 30%
- Squeeze excess air out before sealing
- Every TerraEco roll ships vacuum-sealed with desiccant: don't open it until print day
Drying wet spools
A food dehydrator or filament dryer restores most rolls — see the table below for every material. If a roll has sat open for months in rainy season, dry it before changing any settings.
Drying methods, ranked
- Filament dryer box: best option — set the temperature, walk away, print straight from it
- Food dehydrator: cheapest effective dryer; cut a slot for the spool if needed
- Home oven: risky — thermostats overshoot and melt spools; only with an accurate thermometer
- When unsure, go 5°C cooler and let it run longer: heat is what damages a spool, time is free
Time and temperature, per material
- PLA and PLA+: 50°C for 4–8h — stay at 50, hotter softens the spool
- PETG: 60°C for 6–8h
- TPU: 55°C for 6–8h — among the thirstiest filaments, don't rush it
- ABS: 60°C for 6–8h
- ASA: 60°C for 6–8h
- Nylon (PA): 65°C for 8–12h — dry again if it sits out overnight, and print straight from the dryer
- Resin: never heat-dry it — keep the bottle sealed and out of sunlight; if it thickened after moisture exposure, rest the sealed bottle in 40°C water for 15–20 minutes, then let bubbles rise before filtering
Rainy-season routine
In tag-ulan (rainy-season) months, treat opened spools as a countdown: print from a dry box when you can, reseal the same day you open, and recharge desiccant monthly instead of seasonally. A hygrometer reading past 30% means the box needs attention today, not next week.