Best Filament Dryer 2026: Tested Picks

Wet filament is the #1 invisible quality killer in 3D printing. If your PLA is popping and hissing, your PETG surface looks rough, or your nylon is producing bubbles — your filament absorbed moisture and needs drying.

Here are the dryers that actually work, tested across thousands of hours of production printing.

Why You Need a Dryer

Hygroscopic filaments absorb moisture from the air:

• PLA: Absorbs slowly, prints worse when wet (popping, rough surface)
• PETG: Moderate absorption, stringing and surface defects when wet
• ABS/ASA: Moderate absorption, layer adhesion issues when wet
• Nylon: Extremely hygroscopic — unusable after 24 hours in humid air
• PC: Severe moisture absorption, delamination when wet
• TPU: Moderate, but becomes stringy and inconsistent

If you live anywhere with >40% humidity (most of the US), drying filament before printing improves quality noticeably.

Top Picks

Best Overall: SUNLU S2

The SUNLU S2 FilaDryer is the standard recommendation for good reason.

Specs:

• Max temp: 70°C (upgraded models reach 75°C)
• Capacity: 1 standard spool (1kg)
• Heating: 360° hot air circulation
• Timer: Up to 24 hours
• Price: ~$50-60

Pros:

• Reliable, consistent heating
• Large enough for standard spools
• Feed-through hole lets you print directly from the dryer
• Set it and forget it — timer auto-shutoff

Cons:

• Only fits 1 spool
• 70°C max is borderline for nylon/PC (need 80-90°C ideally)
• No humidity sensor

Verdict: If you own 1-2 printers and print PLA/PETG primarily, this is the dryer.

Best for Farms: SUNLU S4

The SUNLU S4 holds 4 spools simultaneously.

Specs:

• Max temp: 70°C
• Capacity: 4 standard spools
• Timer: Up to 24 hours
• Price: ~$130-160

Pros:

• Dry 4 spools at once — essential for AMS or multi-printer setups
• Same proven heating as S2
• Feed-through holes for all 4 spools

Cons:

• Large footprint
• Same 70°C limit
• Takes longer to heat 4 spools vs 1

Verdict: If you run an AMS or multiple printers, the S4 pays for itself in convenience. Drying 4 spools overnight means your AMS is always ready.

Best for Engineering Materials: Eibos Easdry Pro

The Eibos Easdry reaches higher temperatures.

Specs:

• Max temp: 80°C
• Capacity: 1 spool
• Built-in humidity sensor
• Real-time temperature/humidity display
• Price: ~$70-80

Pros:

• 80°C is enough for nylon, PC, and most engineering filaments
• Humidity sensor tells you when drying is complete
• Better build quality than SUNLU
• More accurate temperature control

Cons:

• Single spool only
• Higher price
• Slightly larger than S2

Verdict: If you print nylon, PC, or PA-CF regularly, the Easdry Pro’s higher temperature and humidity monitoring are worth the premium.

Budget Option: Food Dehydrator

A food dehydrator with temperature control works surprisingly well.

Specs vary, but look for:

• Adjustable temperature up to 70°C (158°F)
• Large enough chamber for a filament spool
• Circular design fits spools naturally

Pros:

• $30-50
• Often reaches higher temps than dedicated dryers
• Available locally at any kitchen store

Cons:

• Not designed for filament — may need modification
• Spool may not fit without removing trays
• No feed-through for printing while drying
• Looks like you’re cooking your filament (because you are)

Drying Times by Material

These are minimum drying times at the recommended temperature. Longer is better for severely wet filament.

PLA: 45-55°C, 4-6 hours PETG: 60-65°C, 4-6 hours ABS/ASA: 60-70°C, 4-6 hours Nylon (PA6/PA12): 80-90°C, 8-12 hours PC: 80-90°C, 8-12 hours TPU: 50-55°C, 6-8 hours PVA: 45-50°C, 4-6 hours

Storage After Drying

Drying is pointless if your filament re-absorbs moisture immediately after.

Best practice:

1. Dry the filament
2. Transfer to a sealed container with silica gel desiccant packets
3. Vacuum seal bags work for long-term storage
4. Print directly from the dryer when possible (feed-through hole)

Desiccant options:

• Reusable silica gel packets — $10-15 for a multi-pack
• Color-indicating desiccant (blue = dry, pink = saturated) — recharge in oven at 250°F for 2 hours

The Real Answer: Prevention Over Cure

The best approach is preventing moisture absorption in the first place:

1. Keep filament sealed with desiccant when not in use
2. Use a dryer as your spool holder during printing (SUNLU S2 feed-through)
3. Don’t leave spools out overnight
4. In humid climates: consider a dry box for active storage

A $50 dryer saves hundreds in wasted filament and failed prints over its lifetime.

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Related: How to Dry Filament Guide, Best Filament for Bambu Lab, Print Farm Accessories.