Kate G. - March 07 2024

Best Filament Dryer in 2024

image from Ricky Impey Youtube

Why Do You Need to Dry Filament?

Firstly, let's talk about filament drying in general. Do you even need to do it? Well, all (or mostly all) 3D printing filament is hygroscopic. Hygroscopic means that a material likes to absorb moisture from the air. So if you tend to leave your filament sitting out exposed to the air, and the air has a lot of moisture in it, your filament is going to invite some of that moisture in. The longer it sits out, the more moisture it'll absorb.

And the more moisture your filament has in it, the harder it can be to print with. Some materials are more prone to this than others. For instance, PETG and TPU are more hygroscopic than PLA. One of the things that happens to moist filament is it can be stringy when it prints, or you can sometimes actually hear little sizzling and popping sounds, and see little puffs of steam coming out of the nozzle.

In areas where humidity is high, it's crucial not to leave filament exposed to the air for a long time. To prevent moisture absorption, it's recommended to store filament in a sealed container such as a gallon Ziploc bag, preferably with a desiccant packet to absorb any moisture present.

It's acceptable to leave filament out for a day or two during printing, it's essential to return it to its storage container promptly afterward. If filament begins to exhibit issues during printing, such as increased stringing or a diminished surface finish, it likely has absorbed moisture and requires drying.

To remedy this, place the filament in a filament dryer and run it through a drying cycle. This process will eliminate excess moisture, restoring the filament to optimal printing conditions and ensuring high-quality prints. Indeed, even brand new filaments can benefit from being dried in a filament dryer.

How to Tell If Filament is Wet?

When filament absorbs moisture, it can cause printing issues like bubbling, popping, and poor adhesion. Here's how to tell if your filament is wet:

1. Visual Inspection on color changes
Check for discoloration or spots on the filament. Moisture can cause filament to change color or develop spots.

2. Cracking or Popping Sounds
When printing, listen for cracking or popping sounds. These noises can indicate that moisture is evaporating within the filament and causing air bubbles.

3. Printing Defects like poor layer adhesion
Wet filament may have a tendency to curl or warp more than dry filament, especially during printing. Pay attention to the quality of your prints. If you notice inconsistent extrusion, poor layer adhesion, or surface imperfections, it could be a sign of wet filament.

4. Stringing prints can signal moisture in filament
Moisture affects viscosity, causing oozing during printing. When filament absorbs water, it forms steam bubbles, increasing stringing. Drying filament before use can mitigate this issue, though other factors like temperature and settings also contribute.

5. Increase Weight of the Filament
Weigh a length of filament before and after drying it thoroughly. If it gains weight after drying, it likely absorbed moisture.

If you suspect your filament is wet, consider drying it using methods like using a dedicated filament dryer. Proper storage in airtight containers with desiccants can also help prevent moisture absorption in the future.

FixDry 2 Spool

Price: $109-$129
Number of spools: 2 spools
Max temp: 70°C
Noise (dB): 65-66
Recommendation: 4/5 ⭐⭐⭐⭐

FixDry 2 Spool, a product that might not be on your radar but deserves your attention. While it may not match that of higher-end models like the iboss, the FixDry 2 Spool boasts superb construction. The user interface is also commendable, featuring four easy-to-use buttons: power, settings, up arrow, and down arrow. These buttons function similarly to those on the Sunlu S2, ensuring intuitive operation.

However, there are some limitations to consider. Unlike more advanced models, the FixDry 2 Spool lacks customizable profiles for different filament types. Changing settings can also be tedious, as the machine resets to factory defaults if unplugged. Nevertheless, labeling multiple machines for different filament types can streamline the process.

The retail price of $130 may seem steep, especially if purchasing multiple units. Yet, the FixDry 2 Spool offers notable features that justify the investment. Notably, its design facilitates easy printing while drying, with multiple holes for ventilation. Additionally, the integrated power supply simplifies setup, although the inability to remove the plug may be a drawback for some users.

Safety is another priority, with a tilt sensor that shuts off the machine if it topples over.

One significant drawback is the noise level, as the FixDry 2 Spool is notably loud. This constant hum, measuring approximately 65-66 dB, may be disruptive in close proximity. However, its compact size allows for placement in inconspicuous locations, minimizing the disturbance.

Overall, the FixDry 2 Spool excels in many aspects, outperforming other models in its category. While the noise level may be a concern for some, its impressive features and build quality make it a worthwhile investment for filament drying needs.

GratKit Firefly

Price: $79-$99
Number of spools: 1 spool
Max temp: 74°C
Noise (dB): 34
Recommendation: 4/5 ⭐⭐⭐⭐

GratKit Firefly, price at $100, which may seem steep for a single filament dryer box. It presents a combination of features from other popular models like the Sunlu S2 and the EIBOS Polyphemus. One standout feature is its extensive manual, which proves essential for navigating its functions, particularly if utilizing the screen or connecting to Wi-Fi. Speaking of the screen, it's admittedly not the most user-friendly, with lag and difficulty in operation. However, it offers numerous features, from adjusting filament type to changing LED colors, although the execution may not be flawless.

GratKit Firefly Filament Dryer Box

$79.00

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Thankfully, the GratKit Firefly filament dryer box comes with a companion phone app that vastly improves usability. With just a tap, users can adjust settings, change filament types, and set drying times ranging from 0 to 24 hours or opt for an infinite dry time. The app also offers pre-set profiles for common filament types like ABS, nylon, carbon fiber, PETG, and PLA, with the addition of two DIY profiles for custom settings.

Despite the initial inconvenience of relying on an application, once open, navigating and adjusting settings on the Firefly becomes far more convenient than on other models. Furthermore, its Wi-Fi integration adds an extra layer of functionality, making it a strong competitor in the market.

However, it's essential to consider that the GratKit Firefly only accommodates a single spool, which may limit its appeal for users with extensive filament collections. Nevertheless, for those with a modest number of rolls, the Firefly presents a compelling option worth exploring.

In conclusion, while the GratKit Firefly may not be the top choice for every user, its combination of features, ease of use through the companion app, and Wi-Fi connectivity make it a worthy contender in the filament drying market.

EIBOS Polyphemus

Price: $129-$199
Number of spools: 2 spools
Max temp: 60°C
Noise (dB): 35-36
Recommendation: 4/5 ⭐⭐⭐⭐

Pros:
1. Adjustable air outlet vent to get rid of the moisture from the dryer.
2. 360° heating, it does not overheat one spot on the filament.
3. Upgrade kit available for 3kg per roll filament drying.

Cons:
1. Need a few assembly work when unboxing.
2. Price is the most expensive in the same dryer space

The EIBOS Polyphemus stands as the most expensive competitor in the filament drying market, and rightfully so, as it offers a myriad of advanced features that set it apart from the rest. While initially skeptical due to the requirement of assembling the lid assembly, any reservations were quickly dispelled upon experiencing its performance firsthand. The build quality is exceptional, boasting a sturdy and rigid construction both in the lid assembly and the base of the machine. Additionally, it features an integrated power supply with a removable plug for added convenience.

The expansion slot is intended for use if you have any 3KG spools available. To utilize it, you'd need to replace the small screws at the bottom of the lid with longer screws provided in the package.

EIBOS Polyphemus incorporates 360° heating, albeit with a unique twist. There's a single heater at the bottom coupled with a stepper motor that winds the filament roll, allowing for even drying. While the efficacy of this method is debatable, its inclusion is commendable. However, using the 360° mode may restrict access to certain holes on the filament spool, necessitating the use of additional filament holder clips.

One notable feature shared with the FixDry is the inclusion of a custom insert that diffuses heat throughout the chamber, ensuring uniform drying. Moreover, the Polyphemus offers ten preset filament profiles, including three customizable options for users working with unconventional materials or specific requirements.

In terms of usability, the EIBOS Polyphemus strikes a balance between the Sunlu S2 and the FixDry, featuring a button-operated screen with six buttons for enhanced functionality. The buttons offer excellent tactile feedback, contributing to a seamless user experience. Despite the inclusion of fans for ventilation, operational volume remains impressively low, barely audible even in quiet environments.

In summary, the EIBOS Polyphemus emerges as a formidable contender in the filament drying market, combining the best features of its competitors into one sleek and efficient machine. While its premium price tag may deter some users, its superior performance, robust construction, and user-friendly interface justify the investment for those seeking the pinnacle of filament drying technology.

Sunlu S2 Filament Dry Box

Price: $69-$99
Number of spools: 1 spool
Max temp: 50°C
Noise (dB): 0
Recommendation: 3/5 ⭐⭐⭐

Pros:
1. automatic timers and presets for different filament drying.

Cons:
1. Max temp only 50°C, not high enough for nylons and PCs drying.
2. No place to release humidity.
3. The port for filament has a wird angle that difficult to print while drying.

The Sunlu S2 is a 3D printing filament drying box that has been my go-to choice for the past year. The current market price for the Sunlu S2 typically ranges from $75 to $80.

What makes the Sunlu S2 stand out is its user-friendly interface. The display is large, clear, and easy to navigate, with only four buttons: settings, up arrow, down arrow, and power. While the Sunlu S2 doesn't support fully customizable profiles with custom names, it does offer pre-set profiles for popular filament types like PLA, PETG, ABS, and PC. Moreover, you can adjust settings within these profiles to suit your specific needs.

The ease of navigation is particularly impressive. Common settings are readily accessible, including temperature adjustment in both Fahrenheit and Celsius, drying time setting, and even an option to toggle the internal light on or off. Setting the drying time is straightforward, as you can incrementally adjust it in one-hour intervals, ranging from 1 to 99 hours. This feature allows for convenient long-term drying, ensuring filament is ready whenever you need it.

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One of the standout features of the Sunlu S2 is its 360° heating design. Heating elements are positioned inside the lid and beneath the filament roll, ensuring uniform heating throughout the box. This eliminates the need for an internal fan, resulting in silent operation. Even with multiple Sunlu S2 units running simultaneously, the noise level remains negligible.

In summary, the Sunlu S2 offers an intuitive user experience, versatile drying capabilities, and silent operation, making it an excellent choice for filament storage and maintenance in 3D printing setups.

Sunlu Filadryer S4

Price: $169-$239
Number of spools: 4 spools
Max temp: 70°C
Noise (dB): 41
Recommendation: 5/5 ⭐⭐⭐⭐⭐

Pros:
1. Holds 4 spools and can even take the larger sized 3kg spool with a printable extension to the unit.

Cons:
1. Noisy Operation

The Sunlu Filadryer S4, relesed on Kickstarter on October, 2023, stands out in the filament drying market for its unique capability of drying four reels of filament simultaneously. Not only does it claim to dry the filament effectively, but it also ensures a low moisture content post-drying. One of its notable features is the inclusion of rollers that allow the filament to turn, along with eight filament outlets equipped with pneumatic fittings. This feature enables easy filament guidance to the printer regardless of any obstacles or extruder setups.

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Heating in the Sunlu Filadryer S4 is powered by a 330W PTC heater accompanied by three fans. One fan draws cool air in while the other two direct hot air throughout the box, aiming for uniform heat distribution. The concept of using a PTC heater was borrowed from EIBOS, while, Sunlu has enhanced it to accommodate a larger space and more reels of filament. The effectiveness of this heating and fan layout is crucial, especially considering that some basic filament dryers lack proper heat distribution, resulting in uneven heating of the filament.

Additionally, caution must be exercised when setting the temperature, as excessively high temperatures could potentially damage certain types of filament. This is particularly relevant for materials like PLA, which are sensitive to high temperatures.

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Another notable feature is the Sunlu Filadryer S4 display, which not only provides temperature readings but also includes a humidity sensor. This internal sensor enables the Filadryer S4 to monitor internal humidity levels and adjust operations accordingly, maintaining the moisture content of your filament. By selecting mode 2 on the display, the Filadryer S4 activates when humidity levels reach 50%, ensuring efficient moisture control. Additionally, the Filadryer S4 features pockets in the bottom where desiccants can be placed, further aiding in humidity control and reducing power consumption during operation in humidity mode.

SUNLU FilaDryer S4

$169.00

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6 Default Filaments Drying Settings

The Sunlu Filadryer S4 offers six pre-configured filament profiles with set values, but users have the flexibility to adjust these values according to their preferences. Users can also set temperature defaults for different types of filament, streamlining the process and eliminating the need to remember specific temperatures for each filament type.

With a countdown timer function, users can set the dryer to operate in constant heat mode for up to 24 hours. Once the timer runs out, the heat automatically turns off, providing energy efficiency and peace of mind.

However, it's worth noting that while the Filadryer S4 allows for setting a box temperature, individual temperature settings for each reel of filament are not supported. As a result, simultaneous drying of different filament types with varying temperature requirements, such as PLA and nylon, is not possible in this configuration.

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Sunlu S4 filament dryer test from Youtuber My Tech Fun

Larger Spool Filaments Drying

Due to the compact size of Sunlu FilaDryer S4, you can modify it for the drying of some of your larger spools filaments, like 2KG per roll spool filaments. There's a printable mod available that extends the top cover of it. But it requires cutting part of the lid, and based on your slicer, it's going to take a few kilograms of material to print. The add-on allows you to increase the height, so you can throw some of the bigger spools inside, or you can dry your shoes in it.;)

These expanded covers can also be used independently or together with the Sunlu top covers opened and snapped into the rear of the new body if you just want to expand your SUNLU to add 4 more spools of filament of regular size. These are held on top of a new deck plate that features holes for air flow and ramps for holding the spools of filament in place.

The new chamber bodies are double wall with just the right amount of infill to leave some air gap for extra insulation. I recommend printing these parts in ABS to withstand the temperatures.

Model design from @HDZ3DWORKS, free to donwnload on MakerWorld.

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Disadvantages of Sunlu Filadryer S4

1. Noisy Operation: The Sunlu Filadryer S4 dryer is reported to be the noisiest among the filament dryers the Youtuber reviewer ModBot has used. This is attributed to the three fans inside the unit that circulate air. The noise level ranges from approximately 50 to 60 decibels, which might not be a problem in a garage or shop environment but could be disruptive in an office setting where noise is a concern

2. Loud Beeping Sound: Whenever you touch any part of the dryer, it emits a fairly loud beeping sound. Although this might not be a major issue once you've set the temperature, it can be annoying, especially if there's no option to turn off the beep.

Creality Space Pi

Price: $69-$119
Number of spools: 1-2 spools
Max temp: 65°C
Noise (dB): 42
Recommendation: 4/5 ⭐⭐⭐⭐

The Creality Space Pi filament dryer engineered to accommodate a single 1 kg spool of filament, it allows for printing while drying by utilizing a filament port located conveniently on the top of the unit. Unlike other filament dryers with multiple feed ports, the Space Pi simplifies the setup with a single port, complemented by included PTFE tubing for versatile connection options to the printer's filament sensor or for directing filament towards the printer.

Creality Space Pi Filament Dryer

$69.00

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With preset temperature settings available for 12 different filament types, ranging from 45 to 70°C, users can achieve optimal drying conditions tailored to their specific materials. However, the dryer lacks preset drying time settings, necessitating manual configuration based on a provided chart, with a maximum runtime of 48 hours. Nevertheless, its default 12-hour cycle offers convenience, allowing users to initiate drying overnight and awaken to completed filament preparation. Following the drying cycle, the Space Pi automatically shuts off its fan and heater while maintaining an active screen display showing essential parameters such as current temperature, relative humidity, selected filament type, drying temperature, and remaining cycle time.

Creality Space Pi filament dryer test from Youtuber My Tech Fun

The user interface features intuitive controls. Additionally, the Space Pi remembers the last used material and temperature settings, optimizing setup efficiency for subsequent uses.

With its fan-driven air circulation system ensuring even drying, coupled with engaging animated sequences during power-up and standby modes, the Space Pi Filament Dryer offers a comprehensive solution for filament preparation in 3D printing setups.

PolyDryer

Price: $80-$99
Number of spools: 1 spool
Max temp: 65°C
Noise (dB): 42
Recommendation: 4/5 ⭐⭐⭐⭐

The PolyDryer is unique designed with two parts, polymer dryer, and polymer dryer box. With this unit, you can dry the filament. The box alone is a storage box, too. This means you can remove the dryer part and attach it to another box.

1. The PolyDryer box: This part holds your filament and is completely clear, making it easy to see what filament is stored inside. It features a lid with a gasket that forms a tight seal when closed with two latches, ensuring an airtight environment. The maximum recommended spool size for the poly dryer box is 205mm tall and 78 mm wide, making it compatible with most spools that are 1 kg or less. However, there may be exceptions for larger spools, so compatibility should be confirmed. The box also includes four bearings and two rollers for the spool to sit on, as well as two grommets for feeding filament through, which can be sealed when not in use. Additionally, there are clear rails on the vertical centers of the box to guide and elevate the filament.

2. The Dry Dock: This component sits on bottom of the box performs the actual drying. In case of issues with spools with smashed edges, a spool roller is included to use the center hole of the filament instead.

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Filament Drying Temps and Times

Filament	Temperature		Timer	Heating level
PLA	50℃	122°F	4H	Ｉ
ABS	60℃	140°F	2H	Ⅱ
PETG	55℃	131°F	2H	Ⅱ
PA	70℃	158°F	12H	Ⅲ
TPU	60℃	140°F	4H	Ⅱ
PC	70℃	158°F	8H	Ⅲ
ASA	60℃	158°F	4H	Ⅱ
PVA	50℃	122°F	4H	Ｉ
PP	55℃	131°F	6H	Ⅱ

In conclusion, each of these filament drying machines offers unique advantages, making it challenging to declare a clear favorite. The Sunlu S2 stands out for its affordability and functionality, making it a solid choice for users on a budget or those looking for a hassle-free option. On the other hand, the FixDry, while lacking in some areas, still serves its purpose well, especially for those seeking a quieter option or needing additional drying capacity.

However, if budget constraints are not a concern, the EIBOS Polyphemus reigns supreme as the pinnacle of filament drying technology. Its comprehensive features, superior build quality, and user-friendly interface make it a worthwhile investment for serious users. Ultimately, the choice between these machines depends on individual needs, preferences, and budget considerations.

Related Products

10KG PETG Filamento 1.75mm

$92.00

Kingroon 10KG PETG filament bundle contains 10 rolls of 1KG 3D printer filament made of high-quality, flexible, strong, and durable PETG.

El filamento PETG de alto rendimiento de Kingroon se basa en la tecnología FFF/FDM, con un diámetro comúnmente utilizado de 1,75 mm, una temperatura de impresión de 210-235 ºC y una temperatura de lecho de 50-80 ºC, y tiene una excelente adhesión entre capas que mejora en gran medida la resistencia y la resistencia a los golpes del prototipo.

PETG es un material muy impermeable que lo convierte en una excelente opción para actividades al aire libre. También tiene una excelente resistencia química, que puede usarse bien tanto en ambientes ácidos como alcalinos, el PETG también tiene una fuerte resistencia al impacto, lo que lo convierte en el material sustituto de PMMA y PC.

Specifications:

Filament Diameter: 1.75mm.
Tolerance: +/- 0.02mm.
Recommended Extrusion/Nozzle Temp.: 210 - 230℃ (410℉~ 446℉).
Heated Bed Temp.: 70 - 80℃(158℉~176℉).
Density: 1.25±0.05g/cm3
Filament Length: 335m

Compatible for Bambu AMS
Notes: Bambu AMS supports spools with a width of 50-68mm and a diameter of 197-202mm.

Package includes:

PETG Filament *10 Pack
FREE shipping from our Mexico local warehouse.
The picture is for reference only. Please adhere to the original products in case of any mistakes.

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【2KG Pack】Black PLA Filamento

$32.00

PLA ImpresiónEl ácido poliláctico, comúnmente conocido como PLA, es uno de los materiales más populares utilizados en la impresión 3D de escritorio. PLA es un excelente primer material para usar mientras aprende sobre la impresión 3D porque es fácil de imprimir, muy económico y crea piezas que se pueden usar para una amplia variedad de aplicaciones. También es uno de los filamentos más ecológicos en el mercado hoy en día. Derivado de cultivos como el maíz y la caña de azúcar, el PLA es renovable y, lo que es más importante, biodegradable.

Black PLA Filamento Impresora 3D 1.75mm compatible for most FDM 3D printers:

PLA Nozzle Temp	220±10°C
PLA Bed Temp	25°C - 60°C
Printing Speed	40-80mm/s
Density (g/cm³)	1.17-1.24(g/cm³ at 21.5°C)
Retraction Distance	1mm
Retraction Speed	20mm/s
Glass transition temperature	60-65°C
Tensile strength (X-Y)	28.1±1.3 MPa
Bending strength	48±1.9 MPa

Specifications:

Material: PLA
Color: Black
Diameter: 1.75mm
Weight: 1kg / pack
Spool size: φ200*64mm (φ8.87*2.5in) / Inside Diameter: 60mm (2.36in)

Package includes:

Black PLA Filamento 1kg * 2 rolls

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Nylon PA6 Filament, White

$29.00

More Reliable Stability: nylon filament is more reliable and easier to print with low moisture absorption and good adhesion to substrates. It has lower moisture absorption and longer shelf life, and a much lower melting temperature (185°C) than conventional nylon consumables.

Excellent Mechanical Properties and Heat Resistance: Nylon PA6 filament is an indispensable structural material with high heat resistance and good impact resistance. 3D printed Nylon PA6 is suitable for producing durable parts with glossy surfaces and high resistance to fracture.

Printing Setting:

Nozzle: 280-300℃, hardened steel nozzle required;
Bed Temp: 25-50℃ (Do NOT exceed 50℃);
Speed: 30mm/s – 60mm/s;
Fan: off
Drying Settings: 80℃ for 12h
Annealing: 70℃ for 2h (To ensure a good heat resistance of your printed part it is recommended to anneal your print model);
Bed Surface: almost any surface with a thin coat of PVA glue or Magigoo PA. The warping will be effectively suppressed.

Notes:

-Abrasion of the brass nozzle happens quite often when printing Nylon PA6. A wear-resistant nozzle, such as hardened steel and ruby nozzle, is highly recommended to be used with our Nylon PA6 filament.
- Nylon PA6 filament is sensitive to moisture and should always be stored and used under dry conditions (relative humidity below 20%).
- If Nylon PA6 is used as the support material for itself, please remove the
support structure before excessive moisture absorption. Otherwise the support
structure can be permanently bonded to the model.
- After the printing process, it is recommended to anneal the model in the oven at 80°C for 6 hours.

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Need help?

Best Filament Dryer in 2024

Why Do You Need to Dry Filament?

How to Tell If Filament is Wet?

FixDry 2 Spool

FIXDRY NT1 Filament Dryer with 2 Spool Holder