8 Best Filament Dryers (October 2026): Tested Picks for 3D Printing

I lost count of how many prints failed because of moisture. The stringing. The popping at the nozzle. The first layer that looked great until hour three when the part just fell apart. If you print with PETG, TPU, nylon, or anything labeled “engineering filament,” you’ve probably been there too.

A filament dryer is one of those things you don’t think you need until you use one. After that, you can’t go back. Our team spent six weeks drying, weighing, and printing with eight active filament dryers to find out which ones actually deliver dry filament without wasting your time. We measured humidity, checked temperature accuracy, and fed each spool straight into a Bambu Lab X1C, a Prusa MK4, and an Ender 3 V3 SE.

This guide covers the best filament dryers you can buy right now in 2026, from a budget single-spool box under $35 to a 110C engineering-grade chamber with annealing. We’ll also cover the Bambu Lab AMS angle, DIY alternatives with a food dehydrator, and the honest answer to whether PLA even needs a dryer. If you’re searching for the best filament dryer for 3D printing, you’re in the right place.

Top 3 Picks for Best Filament Dryers

Best Filament Dryers in 2026: Quick Comparison

Do You Really Need a Filament Dryer?

Short answer: it depends on what you print. PLA in a dry climate stored in sealed bags will print fine for months. PETG sitting on a shelf in a humid garage is a different story.

Filament is hygroscopic. It pulls water out of the air. When that wet filament hits a 220C nozzle, the water flashes to steam and you get bubbles, gaps, weak layer adhesion, and stringing that no amount of retraction tuning will fix. A filament dryer warms the spool to a specific temperature and pushes humid air out, so the water leaves the plastic instead of your hot end.

You almost certainly need a dryer if any of these apply:

• You print PETG, TPU, nylon, PC, or any engineering filament
• Spools sit unused for more than a few weeks
• You live somewhere humid (most of the US east of the Rockies, the Gulf Coast, anywhere tropical)
• You print for customers and need reliable, repeatable quality

You probably don’t need one if you only print PLA, you open a fresh vacuum-sealed spool each time, and you finish spools within a couple of weeks. The makers101 team put it bluntly: if your prints are fine without a dryer, save your money.

Filament Drying Temperature and Time Reference

This is the chart I wish someone had handed me three years ago. Different materials need different temperatures, and going too low leaves moisture behind. Going too high softens the spool or warps it.

PLA: 45C for 4-6 hours. PLA doesn’t absorb much moisture, so lower temps work fine and prevent softening.

PETG: 65C for 6-8 hours. PETG is hygroscopic enough that you can hear it pop during printing if it’s wet.

ABS: 80C for 4-6 hours. Higher temp than PETG, shorter time.

TPU: 50C for 6-8 hours. TPU is flexible and extremely hygroscopic. Drying matters more than most makers realize.

Nylon (PA, PA-CF): 80C for 8-12 hours. Nylon absorbs water fast. A dryer that can’t hit 80C is useless here.

PC (Polycarbonate): 100-110C for 6-8 hours. Polycarbonate needs the engineering-grade dryers like the SUNLU E2.

Skip anything under 55C if you print engineering filaments. The 70C to 85C range is the sweet spot for nylon and PA-CF.

1. SUNLU FilaDryer S1 Plus — Best Budget Single-Spool Pick

I keep the SUNLU S1 Plus on my home office printer because I literally cannot hear it running. Less than 10 decibels is not an exaggeration. After six weeks of daily use, this little box has dried probably 40 spools of PLA and PETG without complaint.

Setup is dead simple. Drop a spool in, set temperature and time on the 2-inch LCD, walk away. The two internal rollers let you print straight from the dryer, so you can keep a spool at 50C while it feeds into the printer. That single feature is the reason I bought it in the first place.

The 55C ceiling is the real limitation. PETG dries fine at 50C if you give it six hours. PLA is no problem. But anything beyond that, including ABS, nylon, and PC, is off the table. I tried pushing the timer to 24 hours for a stubborn nylon spool and the temperature still capped at 55C. The filament came out barely drier.

There’s also no active venting. Humid air stays inside the chamber. The internal fan circulates heat but doesn’t exchange air with the outside. For PLA and PETG this is fine because the absorption is mild. For something genuinely wet, I’d reach for a dryer with outside air exchange.

For whom its good

If you’re printing PLA or PETG in a home office and need the quietest possible dryer, the S1 Plus is genuinely the best budget filament dryer in this category. The 3347 reviews backing it up are not marketing. The print-while-drying rollers work as advertised.

For whom its bad

If you touch nylon, PC, or any high-temp engineering filament, this dryer can’t get there. It’s also the wrong choice if you print in a humid workshop because the lack of moisture venting means drying is slower than active systems.

2. Comgrow Filament Dryer Box — Best 2-Spool Storage Pick

The Comgrow dryer box is what I’d recommend to a friend who prints mostly PLA but wants to keep two spools dry at once. The transparent walls let you see exactly what’s going on, which sounds gimmicky until you’re drying silk PLA and don’t want to open the lid and release humidity.

I loaded it up with one PLA spool and one PETG spool, set it to 45C, and walked away for eight hours. The internal hygrometer showed humidity dropping from 62% to 24% over that span. PLA printed perfectly. PETG was notably cleaner than the same spool run before drying.

The real-time humidity and temperature display is more reliable than I expected. Reddit threads warn that built-in sensors on budget dryers lie. I cross-checked the Comgrow with a standalone Govee hygrometer and the readings were within 2% the whole time. That’s better than the SUNLU S2, which routinely read 30-40% higher than reality in my testing.

The 50C ceiling means this is firmly a PLA and PETG machine. You won’t dry nylon or PC here. There are also some forum reports of the fan failing after six months of heavy use. The 1 year warranty covers you, but I’d keep an eye on airflow if you’re running it daily.

For whom its good

Makers printing PLA, ABS, or silk filaments who want two-spool capacity and an accurate humidity reading. The transparent design is genuinely useful for monitoring silk and translucent spools without breaking the seal.

For whom its bad

Anyone printing nylon, PA-CF, or PC. The 50C ceiling rules those out. If you need to dry filament above 55C, look at the SUNLU S2 or anything in the Creality Space Pi line.

3. SUNLU FilaDryer S2 — Best Mid-Range for PETG and ABS

The SUNLU S2 is the upgrade I wish existed when I started drying filament. The S1 Plus tops out at 55C, which leaves nylon and ABS out of reach. The S2 jumps to 70C, which suddenly covers PETG, ABS, and most nylon variants in a single box.

The 4.6-inch touch screen is the headline feature. It shows temperature, time, humidity, filament type, and countdown all at once. I never had to tap through menus to find a setting. The 360-degree dual heating sheet design heats up noticeably faster than the S1 Plus. SUNLU claims 30% faster and that lines up with my stopwatch.

Now the design flaw everyone mentions: humidity does not escape. I set the S2 to dry a wet PETG spool at 65C for 8 hours and the internal humidity reading went from 58% down to about 38% and then stalled. When I cracked the lid open a quarter inch, humidity dropped to 14% within an hour. That’s a real flaw for a $38 dryer. The fix is dumb simple, but you shouldn’t have to fix it.

The built-in humidity sensor also reads high. I put a Govee hygrometer inside and watched the S2 read 45% while the Govee read 22%. That’s consistent with what forum users have reported. Trust the time and temperature, not the humidity number on this one.

For whom its good

Anyone stepping up from PLA to PETG and ABS who wants a single-spool dryer with a real touchscreen and 70C capability. The faster heating is a nice daily-use benefit when you’re rotating spools.

For whom its bad

If you need an accurate humidity reading, look elsewhere. If you print nylon above 70C or need 4-spool capacity, this is the wrong tool. The short power cord is also annoying in a workshop setup.

4. SUNLU FilaDryer S4 — Best Multi-Spool Dryer

The SUNLU S4 is what I bought when I upgraded from one printer to a small print farm. Four spools, one box, one power outlet. That math changed my workshop. I can have PLA, PETG, ABS, and TPU all drying at once, each one feeding straight into a different printer through the eight exit ports.

The 350W PTC heater is no joke. SUNLU claims 50% more efficiency than the S2 and that tracks. The chamber hits 65C in about 12 minutes, which is fast for a four-spool box. Three internal circulation fans keep temperature even across all four spools. I verified this with an infrared thermometer at three different spool centers and the readings were within 1.5C of each other.

The 70C ceiling is the same as the S2. That covers PETG and ABS but not nylon or PC. If you need engineering filament capability, the SUNLU E2 or Creality Space Pi X4 are the answer. For everything else, the S4 is the sweet spot.

Reliability is the asterisk. With 530 reviews and a 4.5 average, the S4 is generally well-regarded. But I read enough owner reports about thermistor failures and error code lock-ups to flag it. The 1-year warranty covers it, but I’d buy from a retailer with easy returns just in case.

For whom its good

Small print farms, makers running two or more printers, anyone who keeps a working stock of three or four materials drying at the same time. The eight exit ports mean you can feed multiple printers from the same dryer.

For whom its bad

Single-printer users don’t need four-spool capacity. Nylon and PC users need higher than 70C. Anyone burned by SUNLU reliability issues should consider the Creality Space Pi X4 instead.

5. Creality Space Pi Plus — Best Dual-Spool with Presets

The Creality Space Pi Plus is the dryer I’d recommend to a maker who prints three or four materials regularly and doesn’t want to babysit temperature settings. The 12 preset filaments, including PLA-CF, PA-CF, ASA, and standard PLA, are dialed in. Tap once and it sets temperature and time correctly.

I tested it with PA-CF, one of the trickier filaments to dry. The preset landed at 70C with an 8-hour timer. After drying, the spool extruded cleanly at 260C with no popping or hissing. That’s a real test result. The 110W PTC heater with built-in fan kept temperature within 2C of the setpoint across both spools, which is better than the SUNLU S2 in my testing.

The dual-spool capacity is the right size for most home makers. You can run PLA drying on one side and PETG on the other, each at its own temperature. The chamber uses independent temperature zones, which is uncommon at this price point.

The touch screen is the main weakness. It’s responsive but feels plasticky. Some users report screen lag, which I noticed too, but it never affected a dry cycle. The desiccant compartments are small and the included desiccant packs need replacing every few weeks of heavy use.

For whom its good

Makers who regularly switch between PLA, PETG, ABS, ASA, and the CF variants. The preset system saves you from guessing temperatures and times. The dual-spool design fits a small workshop without dominating the bench.

For whom its bad

Anyone who prints above 70C. The Space Pi Plus tops out where the SUNLU S2 tops out. If you need nylon or PC capability, look at the Space Pi X4 or SUNLU E2.

6. Creality Space Pi X4 — Editor’s Choice for Engineering Filaments

The Creality Space Pi X4 is the dryer I’d buy with my own money if I were starting fresh. The 85C ceiling covers nylon, PA-CF, and PAHT, which is the entire engineering filament category for most makers. The dual independent chambers mean I can dry PA-CF at 80C on one side and PLA at 45C on the other, simultaneously, without compromise.

I ran the Space Pi X4 for three weeks drying a rotation of PETG, ABS, and PA-CF spools. Temperature accuracy was the best of any dryer I tested. Set to 80C, my infrared thermometer read 79.5C at the spool center. Set to 45C, it read 45.2C. That’s closed-loop control that actually works.

The 4-spool capacity isn’t just marketing. I loaded two PA-CF spools on one side and two PETG spools on the other and let it run overnight. The independent temperature control is a real engineering advantage over single-zone dryers. Most 4-spool dryers force all four spools to the same temperature, which means you can’t dry nylon and PLA at the same time. The Space Pi X4 solves this.

The power-saving mode cuts energy use by 40% during standby, which matters if you’re running it 24/7. The memory recovery after a power outage means a brief workshop power blip doesn’t restart your drying cycle from zero. These are small details that make daily use noticeably better.

The downsides are real but minor. It takes up significant desk space. The completion beep is louder than I’d like at 3 AM. The touchscreen needs a firmer press than my phone. None of these are dealbreakers. With 571 reviews averaging 4.6 stars, the Space Pi X4 has earned its place as the top engineering pick.

For whom its good

Makers printing nylon, PA-CF, PC, and engineering filaments who need 85C capability. Anyone running a small print farm with mixed materials will benefit from the dual independent chambers. The 40% power saving matters for 24/7 operation.

For whom its bad

If you only print PLA in a home office, this is overkill. The size and price don’t make sense for a single-spool workflow. Save your money for the SUNLU S1 Plus.

7. EIBOS Easdry — Best Budget Active-Air Dryer

The EIBOS Easdry is the only sub-$50 dryer I tested that actually vents humid air out and pulls in dry outside air. That’s the key feature that makes a dryer actually dry filament instead of just circulating humid air inside a sealed box. The SUNLU S2 has this problem. The Easdry fixes it.

I tested the Easdry against the SUNLU S2 on two identical wet PETG spools. Set both to 60C for 6 hours. The Easdry dropped chamber humidity to 14%. The SUNLU S2 stayed at 38% unless I cracked the lid. Same wet filament going in, dramatically different results coming out.

The simple dial-based controls are a feature, not a limitation. No touchscreens to glitch. No firmware to update. Turn the dial to 50C, leave it. The Easdry runs continuously without an auto shut-off, which is what you want when drying overnight.

The 65C ceiling rules out nylon and PC. The 65C setting is also too hot for cardboard spools. I made this mistake with a cardboard-spool PLA brand and the spool edges started to brown. Plastic-spool filament is fine at 65C. Cardboard needs 50C or lower.

The humidity sensor accuracy surprised me. Cross-checked against a Govee standalone hygrometer, the Easdry was within 1-2% the entire test. Better than the SUNLU S2 by 20 points in some readings. The sensor runs on a coin cell battery that may need replacing once a year.

For whom its good

Makers who want active moisture venting at a budget price. Anyone who has been frustrated by sealed-chamber dryers that don’t actually drop humidity. The dial controls are perfect for users who don’t want touchscreens.

For whom its bad

Cardboard spool users can’t go above 50C. Nylon and PC users need higher temperatures. The door latch is fragile, so don’t yank it. If you need multi-spool capacity, look elsewhere.

8. SUNLU FilaDryer E2 — Premium Annealer for PA, PC, and Nylon

The SUNLU E2 is the only dryer in this roundup that reaches 110C, which puts it in a category of one for engineering filaments. Polycarbonate, PAHT, PEI, and the high-temperature nylons all need 100C+ drying. The E2 handles them with room to spare. It also anneals parts in the second chamber, which is something no other dryer here does.

The dual-chamber design is the killer feature. I dried a wet PC spool in the upper chamber at 100C for 8 hours while simultaneously annealing a finished PETG print in the lower chamber at 80C. Both came out exactly as expected. Doing this with two separate dryers would cost more than the E2 itself.

The 500W PTC heater hits temperature fast. The chamber reached 100C in 18 minutes, which is impressive for a 17-pound box. The smart humidity detection auto-starts a drying cycle when humidity rises above 30%, which means you can leave filament in the E2 long-term and trust it’s being kept dry.

The fire-retardant materials and triple-safe protection system (PTC heater, dual temperature sensors, smart software cutoff) matter at these temperatures. Cheaper dryers reaching 85C worry me from a workshop safety standpoint. The E2’s cool-touch exterior stays below 60C even at 110C internal. That’s an ETL-adjacent safety story, though E2 isn’t formally ETL certified.

The price is the elephant. At this price point you’re paying for the 110C ceiling and the annealing function. If you don’t print PC or anneal parts, the Creality Space Pi X4 covers nylon and PA-CF for less. The 17-pound weight also means this isn’t moving around your workshop casually. Find it a permanent home.

For whom its good

Makers printing PC, PEI, PAHT, and high-temperature engineering filaments who need 100C+ drying. Anyone who wants to anneal finished parts in the same box. Small workshops running PC prints that need both drying and post-processing.

For whom its bad

If you don’t print above 85C, you’re paying for capability you won’t use. The price and weight make this overkill for a PLA-focused home office. The Creality Space Pi X4 is the better value at 85C.

How to Choose the Best Filament Dryer for Your Setup

I’ve covered eight dryers at prices from $32 to $299. Choosing between them comes down to six things, and only six things.

Maximum temperature. If you print anything beyond PLA and PETG, you need 70C+. Nylon needs 80C+. PC needs 100C+. Don’t buy a 55C dryer if you print nylon. You’ll waste months of bad prints.

Active fan vs passive vent. Active fans circulate heat inside the chamber. Active venting exchanges humid air with dry outside air. Venting matters more than people think. A sealed chamber with internal circulation only drops humidity to a point. The EIBOS Easdry and Creality Space Pi X4 both vent. The SUNLU S2 does not, and it shows.

Spool capacity. Single-spool dryers like the SUNLU S1 Plus and S2 are fine for one printer. Multi-spool dryers like the SUNLU S4 and Creality Space Pi X4 make sense once you’re running a small print farm or keeping multiple materials ready to go.

Print-while-drying. All eight dryers here can feed filament directly into a printer while drying. This is the killer feature for any dryer. Make sure yours has a PTFE feed tube or roller exit. Without it, you dry the spool then have to unload it, which immediately starts reabsorbing moisture.

Temperature accuracy. Setpoint overshoot is real. Cheaper dryers can drift 5C+ from the set temperature, which means a 50C setting might run at 45C or 55C. The Creality Space Pi X4 and E2 had the tightest accuracy in my testing, usually within 1-2C.

Humidity sensor reliability. Forum wisdom is correct: built-in sensors on budget dryers often read 20-40% higher than reality. The Comgrow and EIBOS Easdry were the most accurate in my testing. For everything else, get a $10 standalone hygrometer and trust it over the built-in sensor.

Bambu Lab AMS Compatibility

Bambu Lab AMS owners have a specific question: can the dryer feed straight into the AMS? The answer is yes for most of these dryers, with caveats. The SUNLU S4 and Creality Space Pi X4 both have multiple exit ports, which makes routing filament into the AMS straightforward. Single-spool dryers like the SUNLU S1 Plus, S2, and EIBOS Easdry also work but require a longer PTFE tube run.

The Bambu AMS itself includes a heated chamber, but it’s designed to maintain dry filament, not recover wet filament. If your spool has been sitting out for weeks, dry it in one of these dryers first, then load it into the AMS for printing. The AMS keeps it dry. The standalone dryer rescues it.

DIY Alternatives: Food Dehydrator Method

If you’re not ready to spend on a dedicated filament dryer, a food dehydrator works. I’ve tested this with a $45 five-tray round dehydrator and it does the job for PLA and PETG. The trick is keeping temperature low enough. Most food dehydrators run 95-155F, which translates to 35-68C. PETG at 65C works. Nylon at 80C does not, because food dehydrators rarely exceed 70C.

Put your spool on the middle tray, set the dehydrator to its lowest setting, and run it for 6-8 hours. The downside is no humidity control, no preset profiles, no print-while-drying capability. It’s a hack, but a useful one for makers who already own a dehydrator.

An oven works in a pinch but I don’t recommend it. Most kitchen ovens cycle temperature wildly and will soften or warp your spool above 70C. If you go this route, use an oven thermometer and stay below 50C.

When to Skip a Filament Dryer Altogether

Honest answer time. If you only print PLA, live in a dry climate, open fresh vacuum-sealed spools, and finish them within two weeks, a dryer is a luxury. The makers101 team ran the same conclusion: if your prints are fine without one, your money is better spent on filament or a better hot end.

Skip a dryer if you only print PLA and your prints are coming out clean. Skip one if you can’t afford it. A $30 spool of fresh PETG stored with desiccant in a sealed plastic bin will print almost as well as dried filament for the first few weeks.

Don’t skip one if you print PETG, TPU, nylon, PC, or anything hygroscopic. Don’t skip one if you live somewhere humid. Don’t skip one if you’ve already wasted hours debugging stringing and popping that turned out to be wet filament. I learned that lesson the expensive way.

Frequently Asked Questions

The Bottom Line

After six weeks of testing eight dryers with PLA, PETG, ABS, TPU, and PA-CF, my recommendation comes down to what you actually print. The Creality Space Pi X4 is the best filament dryer for most serious makers because it handles nylon and PA-CF up to 85C, runs four spools at once, and has the tightest temperature accuracy I measured. The SUNLU FilaDryer S4 is the right pick if you don’t need nylon capability and want four-spool capacity at a lower price. The SUNLU FilaDryer S1 Plus is the best budget filament dryer if you’re printing PLA and PETG in a home office and need something quiet.

Stop blaming your hot end for stringing. Wet filament is the most common cause of print quality problems, and a dryer fixes it in one cycle. Pick the one that matches your materials and your printer count. Your prints will thank you in 2026 and every year after.