【2025 Special Bundle】 SUNLU Official Filament Dryer Box S4,Four-Spool 3D Printer Dehydrator with Rapid Heating, Auto Humidity Control, and Advanced Triple Fan Upgrade, Fits PLA,PETG,ABS,TPU,PA,etc.
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Availability:
20 left in stock
Arrives
Friday, Mar 13
Color: Black
Features
- Four-Spool Filament Dryer Box - SUNLU S4 is the first filament dryer box capable of accommodating four 1kg spools simultaneously. It is equipped with eight filament holes and PTFE tubes, meeting the demands for drying multiple filaments and enabling concurrent printing with multiple printers.
- Fast Heating & Drying Evenly - The SUNLU S4 filament dryer is equipped with a PTC heating element and a triple-fan configuration. The interior heat is efficiently circulated with three fans, making the heating process more even. Additionally, the S4 filament dry box achieves rapid heating up to 70 C in record time. The robust 350W PTC heater is 6.9 times more powerful than the SUNLU S2, ensuring an accelerated and efficient filament drying experience.
- Auto Humidity Control - The SUNLU FilaDryer S4 incorporates a high-precision humidity sensor, displaying real-time interior humidity. Even when the filament dryer is in standby, it will automatically activate when the interior humidity reaches or exceeds 50%, preventing secondary moisture exposure. Thus, it can also serve as your filament storage box.
- Easy to Use - The adjustable temperature range is 35C to 70C, with a setting time from 0 to 99 hours. This 3D printer filament dryer features a large touch screen, providing a tablet-like operation experience. It also comes with pre-configured temperature and drying time settings for commonly used filaments such as PLA, ABS, PETG, as well as PA and PC. This reduces setup complexities and enhances your user experience.
- Universal Compatibility - The SUNLU S4 filament dehydrator is compatible with PLA, PLA+, PETG, TPU, ABS, PA, PC, Nylon, and other high-end 3D filaments. It works perfectly with all standard filament diameters: 1.75mm, 2.85mm, 3.00mm.
- After Sale Service- We provide a lifetime of professional technical support. If you encounter any issues while using it, please contact us (the seller) directly through the 'Ask a Question' feature.
Brand: YOOPAI
Material: Acrylonitrile Butadiene Styrene, Polycarbonate, Polylactic Acid
Color: Black
Item Weight: 1 Kilograms
Item Diameter: 1.25 Inches
Manufacturer: YOOPAI3D
Brand: YOOPAI
Item Weight: 2.2 pounds
Package Dimensions: 20.5 x 14 x 11.5 inches
Item model number: SUNLUS4
Color: Black
Material Type: Acrylonitrile Butadiene Styrene, Polycarbonate, Polylactic Acid
Number of Items: 1
Manufacturer Part Number: SUNLUS4
Date First Available: January 10, 2024
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Mar 13
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Color: Black
Solid drier. I print a lot of filament and a single spool dryer just wasn't going to cut it for my needs. This 4 spool dryer works well and does exactly what i need. I really like that it has outlets for using as a dry and print box. I print directly from this dryer on my bed slingers and the quality had really improved printing from a dry roll. Keeping your filament dry is keep to reducing stringing and having it stay within the box helps reduce tangles. The dryer has a solid amount of preset choices for temperatures for a variety of filaments, but you can fine tune it for any specialty filament. My only wish would be that it was split and could dry 2 types of filament at the same time. However I just throw them in as a little extra temperature doesn't appear to affect my PLA when drying with PETG.
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Reviewed in the United States on November 30, 2025 by Nick..
Color: Black
This SUNLU S4 filament dryer absolutely works like a champ. It heats up quickly, maintains a stable temperature, and the automatic humidity control is a great feature that I didn’t realize I needed until I had it. I love that it can handle four spools at once—super convenient for anyone who prints often or rotates between materials. The upgraded fans circulate air evenly, and I’ve already noticed a big improvement in print quality with moisture-sensitive filaments like PETG and TPU. The whole unit feels well-built and easy to operate. If you want a reliable, efficient filament dryer that just works, this is a great pick.
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Reviewed in the United States on December 8, 2025 by Nelly
Color: Black
I have used this dryer with one roll, 2, 3 and 4 rolls at a time. Performs as expected each time. I have dried pla, petg, and abs. Make sure your spool is also rated for the drying temperature of the filament.
Reviewed in the United States on January 9, 2026 by Gregg Brichan
Color: Black
I have been using the JAYO S1 for a while. It is the most basic of filament dryers. To say the S4 is an upgrade would not do it justice. the S4 is in a completely different category altogether. The S4 comes with a few pieces of tubing so that you can run the filament to your printer without exposing to the open air. Also included are some desiccant packets that can be placed inside the compartments under the spools to provide ongoing dehydration. Each of the 4 spool locations has an option for the filament to load out of the top or out of the end. Overall 8 different output holes. Each output is equipped with a connector that is designed to hold a bowden tube securely. For the outputs not in use SUNLU has provided small rubber plugs to keep the unit sealed. The build quality of the unit is excellent. Everything feels solid and well engineered. There is a lot of plastic, but it doesn't feel cheap or brittle, which is important given that it will be going through a lot of heating and cooling. The feet of the unit are actually metal bars instead of just plastic nubs or stick on rubber. It is this attention to detail that makes it feel like a luxury item. Getting started was really easy. I just plugged the unit in and turned it on. After selected the filament type from the menu all I had to do was let it run. The fans start circulating the heated air immediately and all the items in the display tell you the status. You can see the humidity decreasing on the display within minutes. The internal air circulation allows for very fast drying! I appreciate that the display is backlit for easy readability. My favorite feature of this unit is its ability to monitor the internal humidity and initiate drying when it rises above the selected threshold. The default is 50%, but it is can be set to your desired percentage. For humid environments this could be its best feature for sure! Of course you can adjust the temperature and humidity settings once you have selected from 1 of the 6 built in filament options. It is all very easily done from the front display and control panel. If you want you also enable an LED light to indicate when the unit is actively drying. You can also switch the unit to Fahrenheit or Celsius units for display. The unit is large, so plan for it to take up a fair amount of space. My hobby room is packed, so I had to get creative to make room for it. It is approximately 42cm L x 22cm D x 31cm H. I have seen a few other dryer on the market, but with the unit being able to actively dry 4 spools at a time, it is the best I have found.
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Reviewed in the United States on March 11, 2024 by Cory Cory
Color: Black
Four stars only because when you’re using a multi filament 3-D printer whenever it changes filament it back, feeds the filament and this has no way to wind the schools back up it kind of just create some slack inside the dryer. Other than this, it has caused Little to no clogging. And has really improved my filament and print quality. It has plenty of temperature ranges and humidity settings that you can customize to your liking.
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Reviewed in the United States on February 25, 2026 by Reviews Guy
Color: Black
I’ve been using this for the past six months and I would say that it is pretty effective in drying out your spool, most of the time when you press power on it runs on an automatic six hour cycle with the set temperature that you have on your machine. I do not have to re-dry after six hours on a lot of my school however certain filament such as TPU, you have to leave it in there for longer, but overall the machine does what it’s supposed to do as advertise. I am very happy with the Sunlu four spool dryer machine. One addition that I made to the machine is printing a larger handle for the dryer and it is much easier to open that way you can also print a handle to hold the both of the flaps, however, I find that it is not necessary.
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Reviewed in the United States on February 21, 2026 by Mark Hanes Mark Hanes
Color: Black
Have had this dryer for a little while now and it was supposed to take the place of drying my filament in my custom built reflow oven, but it doesn't keep the filament dry after the initial cycle as described. The dryer can run for the specified amount of time or longer and I have found that i get better prints running the old way. This dryer is not designed for it's intended purpose unless you live in maybe a low humidity area. dry boxes with desiccants do better. Even the indicating desiccants in the bottom of the dryer never seem to get dry even at a 15hour cycle at 75C so there is a lot to be desired with this machine.
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Reviewed in the United States on January 12, 2026 by Adam
Color: Black
Filament was constantly breaking in my A1 until I got this dryer. Love the continous dehumidifier setting.
Reviewed in the United States on January 16, 2026 by SLN