【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.
Condition: Used - Very Good
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Availability:
Only 1 left in stock, order soon!
Arrives
Sep 20 – Sep 24
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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.
Description
SUNLU S4 Filament Dryer_Black SUNLU S4 Filament Dryer_White SUNLU S4 Filament Dryer_Grey Humidity Regulation Mode Auto-drying When The Interior Humidity Reaches or Exceeds 50% Humidity Regulation Mode Auto-drying When The Interior Humidity Reaches or Exceeds 50% Humidity Regulation Mode Auto-drying When The Interior Humidity Reaches or Exceeds 50% Heater PTC Heater With 3 Fans Heater PTC Heater With 3 Fans Heater PTC Heater With 3 Fans Maximum Printers 4 Printers Available Maximum Printers 4 Printers Available Maximum Printers 4 Printers Available Heating Temp 35°C~70°C Heating Temp 35°C~70°C Heating Temp 35°C~70°C Drying Time Setting 0-99 Hours Drying Time Setting 0-99 Hours Drying Time Setting 0-99 Hours
Brand: YOOPAI
Material: Acrylonitrile Butadiene Styrene, Polycarbonate, Polylactic Acid
Color: Black
Item Weight: 1 kg
Item Diameter: 1.25 inches
Brand Name: YOOPAI
Additional Features: Four-Spool Capacity, Rapid Heating, Auto Humidity Control
Global Trade Identification Number: 27
UPC: 850055848627
Manufacturer Part Number: SUNLUS4
Unit Count: 1 Count
Manufacturer: YOOPAI3D
Number of Items: 1
Model Number: SUNLUS4
Warranty Description: 2
Item Weight: 1 kg
Item Diameter: 1.25 inches
Material Type: Acrylonitrile Butadiene Styrene, Polycarbonate, Polylactic Acid
Color: Black
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sep 20 – Sep 24
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
The Sunlu filament dryer works well. All of their products are great quality at a decent price. The customer service is great. It's easy to operate just remember to rotate your spools. It comes with a few tubes ready to connect to your printer.
Reviewed in the United States on March 18, 2026 by John
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
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 R.G. Reviews
Color: Black
Living in the southeast part of the USA means there is a lot of humidity around. This has really helped with the quality of the 3D prints I'm putting out. It is easy to use and very compatible with the printer's AMS allowing me to feed filament directly from this dryer into the AMS and to the nozzle without ever being exposed to the ambient air.
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Reviewed in the United States on April 15, 2026 by Rooney
Color: Black
I purchased this filament dryer and was quite excited while awaiting its arrival. Upon arrival the two lids were broken off even though there was no damage to the package. The lids are held on by one pin on each side both of which were bent when the lids came off. With my pliers I was able to straighten them out and reinstalled the lids. Drying: This dryer does an awesome job at drying the filaments and was almost plug and play. Feeding: The major issue seems to be with printing from a filament that was in this dry box. I started having major under extrusion which made me investigate. I then realize that it is a nightmare to try and print from this box. It seemed that the bearings don't spin freely which caused the full spools to twist and falloff the rollers. The position of the ptfe holes in relation to the spool creates addition friction that my extruder just cannot overcome. Conclusion: If you are looking to just dry your filament, then this box will get that done no problem. However, of you want to print from the box, then this is not the box for you. I will return this item because one of the reasons why I purchased it was to be able to print directly from the dry box.
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Reviewed in the United States on December 11, 2024 by Fabian
Color: Black
I bought the SUNLU S4 bundle to dry my filament before starting my custom 3D projects, and it has been a game-changer. Living in a humid area, moisture is always a problem, but this box keeps everything perfectly dry. I now print directly from the dryer box using the built-in PTFE outlets. The four-spool capacity is amazing I can keep my most-used filaments ready to go at all times. The heating is very fast and it maintains a consistent temperature throughout the box. If you want to eliminate bubbles and stringing in your prints, especially on a fast machine like the Bambu A1, this S4 dryer is worth every penny!
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Reviewed in the United States on April 23, 2026 by Alex