【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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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
20 left in stock
Arrives
Sunday, Dec 7
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: 12.7 Pounds
Item Diameter: 1.25 Inches
Manufacturer: YOOPAI3D
Brand: YOOPAI
Item Weight: 12.74 pounds
Package Dimensions: 20.12 x 14.25 x 11.22 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:
Sunday, Dec 7
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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Top Amazon Reviews
Color: Black
If you print in colour or run multiple machines, this is exactly what you need. The internal space supports four full spools, and the eight filament-feed holes allow you to run multiple printers simultaneously. I love that I can load everything, set the timer/humidity, and walk away. Worth every penny.
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Reviewed in the United States on November 11, 2025 by Charles Trayes
Color: Black
The SUNLU S4 filament dryer is a must-have for serious 3D printing. It holds up to four spools at once, keeps moisture at bay, and helps prevent clogs and stringing — especially with hygroscopic filaments like TPU and nylon. The interface is simple, the build is solid, and it runs quietly. If you print often or in bulk, this dryer box is a total workflow upgrade
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Reviewed in the United States on October 27, 2025 by David C.
Color: Black
Product has been great, use it for storing filament that is not used often. TPU does with this machine.
Reviewed in the United States on October 30, 2025 by Jeffrey Hamilton
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
Works great!
Reviewed in the United States on October 28, 2025 by V-Spec Printing
Color: Black
Works Great with my 3d printer. I really like that it keeps my filament dried out while still using it.
Reviewed in the United States on October 6, 2025 by Branden Hawley
Color: Black
For the price I was expecting a little more. Don't get me wrong its ok but there are some things I think they missed the mark on. First is Mine has a weird Rainbow looking distortion on the front plastic semi clear cover. Almost like stress color marks or discoloration from heat> Hard to see in the pictures but I circled it in red. It's pretty annoying to look at this and see weird rainbow swirls in the front panel. This must indeed be a factory defect as I have not heard anyone else mention this. Here is a list to make it easier. PROS: Heats up quickly and fans are powerful. Large 4 spools capacity is nice. At the end of the cycle it can go into a maintenance mode that will turn unit back on if humidity gets above a set threshold. The feel to it seems good quality. The top latches feel nice and are good quality. Mutiple filament output holes on top and sides CONS: The front see thru plastic is so dark you really can't see any of the spools inside when top is closed. ( why Make it clear if it's not clear? Fans are loud and they blow right into the spool so that one spot on the spools gets most of the heats and blocks airflow. There are no seals around the lid to keep airtight for storage. The front semi clear panel is also not sealed so this thing does not keep moisture out as it has so many spots for outside humidity to creep in. Doesn't dry my filament as fast as some of my other smaller cheaper dryers despite its high price tag and good looks. You need to rotate the spools once in a while or they will get hot spots from the fan blowing right onto the spool. It's not a bad unit I just think for the price it could have been better with a few simple things. But I am really not happy about the discoloration Rainbow on the clear panel. UPDATE: the reached out and helped with the discoloration issue on the front clear cover so very good great customer service.
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Reviewed in the United States on May 22, 2024 by BigL BigL
Color: Black
Packing was perfect, no damage, but when I plugged in the unit it died immediately. i find out that the display doesn't stay on. In the lower right there is a small icon to turn on the power. So far it is running five during the test trial.
Reviewed in the United States on July 28, 2025 by digitalbeachbum