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SUNLU S4 3D Printer Filament Dryer Boxer, Black | 4-Spool Storage Box, Auto Humidity Control, 350W PTC Fast Heating, 70℃ Max Temperature, For 3D Printer Filament

  • Based on 96 reviews
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Availability: Only 10 left in stock, order soon!
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Arrives Monday, Aug 24
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Color: S4 Black


Features

  • 1Large Space for Endless PrintingExperience uninterrupted 3D printing with SUNLU New S4 Filadryer the first filament dryer box that effortlessly handles 4 spools 1KG 3D Printer Filament simultaneously.With the new generation filament drying box, we can embrace the freedom of multi-color and multi-machine 3d printing.
  • 2Updraded Lightning-Fast HeatingGet to heating quicker with the S4 filament dry box's impressive 350W PTC heater. In just 30 minutes, it heats up from 25C to 50C, ensuring 50% faster and more efficient heating than other filament dryer box in the market. Efficiency meets speed for a next-generation 3d printing experience.
  • 3Triple Security for Worry-free PrintingRest easy knowing the S4 filament storage box prioritizes your safety. Its triple-layer security PTC, temperature switch, and software protection keeps a vigilant eye on temperatures, ensuring a worry-free 3d printing environment with real-time alerts for any unexpected changes.
  • 4Triple Fans for Uniform DryingSUNLU New generation S4 filament dehydratorr equipped with three build-in fans two circulating fans on the sides and 1 on the bottom. It maintains a temperature balance inside the box within 3C, guaranteeing optimal drying for every section of the filament. Efficiently rescue your wet filaments.
  • 5Smart Auto Humidity Control3D printing users can adjust the internal humidity by mode 2(humidity range 30%~50%). The S4 dryer will auto start drying when humidity hits your desired range, ensuring your filament stays dry. And will stop drying when humidity below 25%, catering to avoid excessive drying of the filament.
  • 6Universal CompatibilityCompatible with all FDM 3D printers, the S4 filament dryer supports connection to 4 printers simultaneously, accommodating 99.99% of filaments in the market. SUNLU has over 10 years of experience in the 3D printing industry and a professional after-sales team to make your printing worry-free.

Description

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Brand: SUNLU


Color: S4 Black


Material: Polylactic Acid Acrylonitrile Butadiene Styrene Polyethylene Terephthalate Glycol


Special Feature: Handles 4 spools simultaneously, Fast Heating, Triple Security, Auto Humidity Control


Style: Modern


Item Dimensions L x W x H: 20.31"L x 8.31"W x 20.31"H


Number of Items: 1


Number of Compartments: 4


Unit Count: 4 Count


Package Quantity: 1


Color: S4 Black


Style Name: Modern


Material Type: Polylactic Acid Acrylonitrile Butadiene Styrene Polyethylene Terephthalate Glycol


Other Special Features of the Product: Handles 4 spools simultaneously, Fast Heating, Triple Security, Auto Humidity Control


Water Resistance Level: Not Water Resistant


Opening Mechanism: Lift-Off Lid, Latch


Brand Name: SUNLU


Recommended Uses For Product: High-efficiency heating


Included Components: Filaments Storage Box


Manufacturer: SUNLU


Model Number: S4 Filament Dryer


Manufacturer Part Number: Official Filament Dryer S4


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Aug 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.

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Top Amazon Reviews


  • Super nice, works well in my humid basement.
Color: S4 Black
Great product, and cheaper than getting individual single spool dryers. It also reaches higher temps than my SUNLU S1 Plus, and has pockets for desiccant cages to be dropped in. The screen is a lot nicer than the S1 Plus too, and it has a humidity maintenance mode that lets me keep my filament inside it for several days without using an asenine amount of electricity like normal drying operations might. I find this important since my printers are in the basement with a %RH of 60%+ sometimes. My only problem is the unit generates static. I can hardly tell, but it is definitely generating static. If I leave my build plate on top of it while it's running I always get a tiny shock when I grab it off of there. My cat's hair loves clinging to the tinted window panels too. This static shouldn't be problematic at all, but it is a *shocking* quirk of the device. ... show more
Reviewed in the United States on June 23, 2026 by Sam S

  • Drys good and nice powers on fast instantly starts working
Color: S4 Black
Perfect powers on right away
Reviewed in the United States on July 19, 2026 by Ceasar Chavez

  • Great dryer, easy to use.
Color: S4 Black
Excellent and intuitive, with a timer that automatically shuts off so there no worries or having to remember to check it.
Reviewed in the United States on May 6, 2026 by G. Prince

  • Works great
Color: S4 Black
Works great. Just wished I looked at the s4 pro, as it has two different heaters. But if you load the same type of filament it's not a problem.
Reviewed in the United States on August 2, 2026 by John smith

  • BEST DRYER!
Color: S4 Black
One of the BEST purchases! I looked for a month or two at a ton of different dryers and came across this one. It has been a gamechanger for me! My filament is dry and it doesn't take HOURS! I live in a humid area and this machine has made such a difference! BUY IT! I went for a 4 spool because it wasnt much more than any other models that hold one or two. I never have to worry about wet filament because I keep 4 colors in and run it once a day. ... show more
Reviewed in the United States on March 16, 2026 by Ashley T.

  • Would recommend.
Color: S4 Black
I did a massive search for a dryer that fits my needs. I was using a doof dehydrator before and wanted something a little better. The screen is a little lacking, but it works for what you need. I like that I don't have to remember what settings I need for basic filament. The quality seems to be decent. Doesn't need anything robust. I haven't used straight printing yet, but I'm sure the flow from it works just fine. ... show more
Reviewed in the United States on April 21, 2026 by Christopher Bishop

  • Does what it’s supposed to. Interface is not great.
Color: S4 Black
Works as expected. The controls are not great. I may need to spend some time reading up on all the functionality. Surprised that is necessary for something as basic as this. I can’t seem to turn it on and just see the humidity and settings without it starting to heat up to dry the filament. Should be an easier way to work with it without immediately starting to heat up. The user interface is not great for a solid product that has been refined over years. ... show more
Reviewed in the United States on December 19, 2025 by littleab

  • Works for exactly like it should.
Color: S4 Black
This works really well. Easy assembly and options for the filament to exit from the side or from the top so i can use it for multiple single color printers at a time. I almost always use this with PETG and i have had no issues printing while using this dryer. Just wish it was a little bigger so my 3kg spools would fit in it. ... show more
Reviewed in the United States on April 29, 2026 by Kerry Bertrand

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