Top 4 Best Filament Dryers

If you’ve ever heard that hiss or seen little puffs of steam while printing, you know that best filament dryer can feel like a magic wand for 3D printing. Moist filament leads to bubbling, popping, and weak layers. But a good dryer tames that moisture monster fast. Let’s chat through why you need one, what to look for, and which models shine.

Why You Need a Filament Dryer

Filament drying isn’t just geek talk. All common materials—PLA, PETG, TPU, and especially nylon—grab moisture from the air (they’re hygroscopic). Because that water turns to steam in your hotend, you get:

• Stringing (those pesky hair-thin webs)
• Bubbles in your layers
• Under-extrusion or gaps
• Crunchy popping sounds mid-print (Yikes!)

And for sensitive materials like PCTG or carbon fiber blends, moisture can wreck your prints. So the best filament dryer isn’t a luxury—it’s a game changer for quality.

How to Choose the Best Filament Dryer

Before we dive into specific models, here’s what to consider:

• Capacity: How many spools do you dry at once?
• Max Temperature: Nylon and PC need up to 70–80 °C. PLA and PETG only need 40–55 °C.
• Heating Method: PTC heaters heat fast and safely.
• Noise Level: If you print at night, quiet matters.
• Printing While Drying: Some dryers let you feed filament directly to the printer.
• Built-In Storage: Dryers that double as storage boxes keep filaments ready.

Because each maker’s needs differ, mix these must-haves with your budget to find the right match.

Top Picks for 2025: Best Filament Dryer

Below are four of the best filament dryer options, from budget to pro:

SUNLU Official Filament Dryer Box S4 (Four-Spool)

• Price: $150
• Capacity: Four 1 kg spools
• Temp Range: 35 °C–70 °C
• Features: PTC fast heating, humidity sensor, built-in desiccant pockets

Why it’s great
SUNLU’s S4 is like a small humidifier that works backward. It draws moisture out, then shows you the humidity level on its screen. You can dry up to four spools together, each feeding to your printer if you like.

Pro tip
Use mode 2 (humidity-triggered) so it only heats when moisture creeps above your set point. Saves power and protects heat-sensitive PLA.

Buy SUNLU S4 on Amazon

Official CREALITY Space Pi Filament Dryer Plus

• Price: $90
• Capacity: Two spools
• Temp Range: 40 °C–65 °C
• Features: 160W PTC heating, filament feed port, simple display

Why it’s great
Space Pi is compact and reliable for two spools. You can print directly while drying through its top port (no more reloading). And its presets for PLA, PETG, ABS, and nylon are straightforward.

Pro tip
Rotate your spool halfway through drying for the most even results.

Buy Space Pi Dryer on Amazon

Comgrow 3D Printer Filament Dryer Box

• Price: $50
• Capacity: One spool
• Temp Range: 35 °C–65 °C
• Features: Digital timer, adjustable temps, clear door

Why it’s great
On a budget? Comgrow’s dryer gets the job done for one spool. It’s quiet enough to sit next to your printer and has a clear window so you can see filament color changes.

Pro tip
Set a 4-hour cycle for PLA, 6-hour for PETG, and 12-hour for nylon.

Buy Comgrow Dryer on Amazon

Polymaker 3D Printing Filament Dryer and Storage Box

• Price: $80
• Capacity: One spool
• Temp Range: 40 °C–60 °C
• Features: Two-in-one dryer and storage, desiccant trays, airtight seal

Why it’s great
Polymaker’s dryer combines storage and drying in one unit. After drying, just seal it up for long-term storage. The box holds humidity below 5 percent, so your spools stay fresh.

Pro tip
Leave filament in the box for short print sessions—no need to re-dry each time.

Buy Polymaker Dryer on Amazon

Quick Tips for Drying Success

• Match Temp to Material
  • PLA: 40 °C for 4 h
  • PETG: 55 °C for 2 h
  • Nylon: 70 °C for 8–12 h
• Use Fresh Desiccant
  Replace silica packs every 3–6 months.
• Check Humidity
  If your dryer has a hygrometer, aim for 5 percent or below.
• Print While Drying
  Feed directly if your dryer supports it to save reload time.
• Store in Bags
  When you finish, toss spools into filament storage bags for extra protection.

These bullet points help you nail dryness without guesswork.

Beyond Dryers: Proper Filament Storage

Dryers solve moisture now. Storage keeps it away later:

• Filament Storage Box: Holds multiple spools at once, keeps out dust and humidity.
• Vacuum-Seal Bags: Suck out air for long-term storage.
• Dry Cabinets: The Rolls-Royce solution for serious makers.

Real-World Results

I dried a nylon spool in the SUNLU S4 overnight and printed a set of living hinges the next day—no bubbles, perfect flex. With Space Pi I revived a PETG roll that had been clumpy, and in two hours I was back printing smooth parts. It’s amazing how much dryer performance affects print success.

Friendly Sign-Off

There you have it—the best filament dryer options to banish moisture and up your print game. Whether you choose a four-spool SUNLU S4, a mid-range Space Pi, a budget Comgrow, or a sleek Polymaker unit, your prints will thank you with crisp layers and zero popping. Happy drying and even happier printing!

‍