How to Dry 3D Printer Filament — Complete Guide (2026)

Filament absorbs moisture from the air over time — even PLA, which is considered the least moisture-sensitive material. When wet filament prints, water vaporizes in the hotend causing steam, popping sounds, weak layer adhesion, stringing, and rough surfaces. Drying your filament is one of the most effective print quality fixes.

Which Filaments Need Drying?

Filament	Moisture Risk	Drying Temp	Drying Time
PLA	Low–Moderate	40–45°C	4–6 hours
PETG	High	50–55°C	4–6 hours
ABS	Moderate	65–70°C	4–6 hours
TPU	Very High	50–55°C	8–12 hours
Nylon	Extreme	70–80°C	10–12 hours
ASA	Moderate	65–70°C	4–6 hours

Method 1: Filament Dryer (Best)

Dedicated filament dryers like the Sunlu S2, Sunlu Filadryer E2, or Sunlu Filadryer S4 are purpose-built for this. They hold the spool on a rack, circulate warm air, and often print from the dryer through the top feed hole. We stock filament dryers at Forgely Roy — walk in to compare models.

Method 2: Food Dehydrator

A food dehydrator works surprisingly well. Most have adjustable temperature and even air flow. Just make sure the spool fits inside and the mandrel doesn't interfere. Set the temp according to the table above and let it run.

Method 3: Kitchen Oven (Budget)

If you don't have a dryer or dehydrator, your kitchen oven works — but be very careful. Most ovens don't go low enough, so you may need to prop the door open slightly. Use a thermometer to verify the actual temperature. Never leave filament in the oven unattended.

Signs Your Filament is Wet

• Popping or crackling during printing — water boiling in the hotend
• Stringing that wasn't there before — even with correct settings
• Rough, grainy surface on prints that previously looked smooth
• Weak layer adhesion — parts break easily along layer lines
• Steam or vapor coming from the nozzle
• Bubbles in extrusion visible on the printed part

Prevention: Store Filament Right

Once dried, keep it dry. The best approach: sealed containers with desiccant packs. Options include zip-lock bags with silica gel (cheap), airtight food containers from the kitchen aisle (surprisingly effective), or dedicated filament dry boxes. If you print frequently, a dryer that doubles as a dry box is ideal.

We stock Sunlu filament dryers, airtight containers, and desiccant packs at Forgely Roy — stop by to see which storage solution works best for your setup.

📍 Forgely Roy — 5519 S 1900 W, Roy, UT 84067
📞 385-449-2694
⏰ Mon–Fri 11–6 • Sat 11–3
🛒 Shop filament dryers & accessories