Best Filament Dryer 2026: Tested for PLA, PETG, Nylon & TPU

A filament dryer is the cheapest upgrade that makes the biggest difference to print quality once you move past PLA. Wet PETG, nylon, and TPU string, pop, and print weak — and they soak up moisture from the air whether you print with them or not. This guide ranks the best filament dryers we tested in 2026, from print-farm 4-spool boxes to budget single-spool units.

Best filament dryers at a glance

Why wet filament ruins prints

Most 3D printing filaments are hygroscopic — they pull water out of the air. PETG, nylon, TPU, PVA, and carbon-fiber blends are the worst offenders, and nylon can absorb enough moisture to degrade print quality within hours of leaving its sealed bag. When that water hits the hot nozzle it flashes to steam, which causes the tell-tale stringing, popping and crackling, blistered surfaces, weak layer adhesion, and brittle parts.

A dryer fixes this by holding the spool at a stable low temperature so the moisture bakes back out, and — crucially — every unit below has a filament pass-through port so you can print straight from the box and the spool never re-absorbs water mid-print. That’s the key advantage over a sealed desiccant box, which keeps dry filament dry but can’t actively remove moisture that’s already there.

1. Sunlu FilaDryer S4 — Best Overall

The S4 is the dryer most people who print more than occasionally should buy. Holding four 1 kg spools means you can dry a whole material’s worth of filament overnight and feed two printers from one box. The 350 W PTC heater and three fans heat evenly to 70 °C, and the storage mode keeps spools dry between jobs. It’s bulky, but if you fight moisture often it’s the most capable consumer dryer here.

2. Creality Space Pi Plus — Best Budget

The biggest problem with budget dryers is that many never reach their advertised temperature. The Space Pi Plus is the exception — in community testing it holds its setpoint reliably, which is exactly what you want for PLA and PETG. The 360° circulation system dries the spool evenly, and the one-key presets mean there’s nothing to learn. For most hobbyists drying everyday materials, it’s all you need.

3. Eibos Cyclopes — Best Dual-Spool

If you want the most accurate temperature control without stepping up to a print-farm box, the Cyclopes is the pick. Independent testing has it heating faster and holding within roughly ±2 °C of setpoint versus the ±3 °C swing on the Sunlu S2, and the live humidity sensor lets you actually confirm the filament is drying instead of guessing. Two-spool capacity and quiet operation round it out.

4. Sunlu FilaDryer S2 — Best Value Single

The S2 is the dryer that put active drying on every hobbyist’s desk, and it’s still a smart buy. The 360° heating wraps the spool more evenly than older one-sided designs, and the 70 °C ceiling covers every common material. It’s not the most precise box here, but it’s reliable, affordable, and easy to find — a safe default if the Cyclopes is out of stock.

5. PrintDry Pro3 — Best for Nylon & Carbon Fiber

If your primary materials are nylon, polycarbonate, or carbon-fiber composites, the Pro3 is the tool that actually solves the problem. Those filaments need higher drying temperatures and longer cycles than a $45 box can deliver, and the Pro3’s higher ceiling and steady heat get them genuinely dry. Pair it with vacuum-seal storage and your engineering filament stays print-ready for months.

6. Sovol SDB01 — Best Compact

When desk space and budget are both tight, the Sovol SDB01 covers the basics without fuss. It heats to 70 °C, shows temperature and humidity, and held its own against pricier boxes in independent drying tests on PLA and PETG. It won’t dry nylon as aggressively as a PrintDry, but for everyday materials in a small space it’s a tidy, affordable choice.

How to dry filament correctly

• Match the temperature to the material: ~45-55 °C for PLA, 55-65 °C for PETG and ABS, 70-80 °C for nylon and polycarbonate. Stay below the glass-transition temperature so the spool doesn’t soften.
• Give it time: 4-6 hours for most spools; 8-12 hours for very wet nylon or PA-CF.
• Print from the box: Use the pass-through port and a dry box so filament can’t re-absorb moisture during a long print.
• Store dry, not just dry once: Keep dried spools in sealed bags or boxes with fresh desiccant between uses — drying is wasted if the filament sits open afterward.
• Watch the humidity readout: A dryer with a live humidity display tells you when the spool is actually dry instead of guessing by the clock.

How to choose a filament dryer

• Capacity: One spool is plenty for a single printer; step up to the S4 or a two-spool box if you run multiple machines or print farm-style.
• Max temperature: 70 °C covers PLA, PETG, ABS, and TPU. Only nylon, PC, and carbon-fiber blends need a higher-temperature box like the PrintDry Pro3.
• Temperature accuracy: Cheap dryers often undershoot their rating. The Cyclopes and Space Pi Plus hold setpoint best in testing.
• Humidity sensor: A live readout is the difference between knowing your filament is dry and hoping.
• Pass-through + storage: A pass-through port lets you print while drying; a storage/keep-dry mode protects spools between jobs.

The bottom line

The Sunlu FilaDryer S4 is the best filament dryer for most people — four spools, even heat, and the muscle to dry anything from PLA to nylon. On a budget, the Creality Space Pi Plus holds its temperature reliably for a single spool, and the Eibos Cyclopes gives you the tightest temperature control plus a live humidity readout. Drying your filament matters most for the materials in our best 3D printer filament guide — especially PETG and nylon. New to printing? Start with our best 3D printer for beginners picks, or browse the full best 3D printer rankings.