【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.

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.

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.

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.

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.

I live in Ohio and summers are humid. Never really worried about wet filament. Even filament that is now 5 years old has printed well on my new Bambu A1. PLA will benefit from the dryer and prints are a bit nicer. It is all the other filaments that really improve once dried. For me, PETG is much improved after being dried. Plus, if you ever give it a thought. Most filaments come from very humid locations like Vietnam and other locations in Asia. Probably why most brands recommend drying new filament for 6 hours prior to use. Yes, the S4 might be more than many need and it is a bit pricey. But, 4 rolls drying together and the ability to leave them in there and the dryer kick only if humidity rises is great. You can feed spools out of the dryer, but as an AMS user. Without heavy tinkering, I doubt I will use it this way. Another bonus, throw your desicant pouches and containers in the box to reactivate them. Then store your recharged desicant and dry filament in vac bags or cereal boxes. The bags are a bit cumbersome, but better long term. If you can afford it. Buy it. The prints only get crisper with dry filament.

I love this dryer. I have 4 spools in it at all times. I love that you can set it to automatically go on when humidity rises. Great to keep the filament dry at all times. When you first turn this on, it's going to run for several hours. Sort of initial drying. But you can change that down to just one hour. However, I suggest you run the full initial drying when you insert a new spool. I do the initial drying and then I place them in a vacuum bag with desiccant. After that I just put the color I want at the moment in the dryer and print. It will keep the spool dry while you print. I spool the filament to the printer from the dryer. keep in mind that using the top exit holes can be problematic whe opening the chamber. More so when you close the lid. I wish the filament exit was all on the same side of the machine though. Maybe I can figure a way to do this. To sum it all up, I'm very happy with my purchase and you will too.

Werkt perfect en heeft ook nog een zuinige bewaarmodus. Kan 4 rollen tegelijk drogen / opbergen.

If you 3D print with any moisture-sensitive material like Nylon, PETG, or TPU, you need the SUNLU FilaDryer S4. ​Huge Capacity: Drying four spools at once is a massive time saver. ​Perfect Prints: The precise temperature control ensures my filaments are bone-dry, eliminating bubbles and stringing for clean, reliable prints. ​Print and Dry: I love being able to print directly from the unit while it keeps the spools warm and dry—it's brilliant for long prints. ​This is the best filament management tool I've ever bought. Highly recommended!

Does as it says , quick , efficient, what else is needed? Thankyou Sunlu !

Acheté car j'en avais marre des filaments avec de l'humidité, qui faisaient des bulles et des fils. Et bien je peux dire que c'est génial. Le boitier ne prends pas trop de place ' pour un appareil pouvant contenir 4 bobines en même temps) , il ne fait pas trop de bruit, et est vraiment efficace. J'adore, Je passe toutes mes bobines dedans avant d'imprimer maintenant, même les neuves sortie de sachet. Si on devait être chiant , je dirais que ça aurait été top si on avait pu avoir une cloison dans le boitier pour séparer en deux côté et pouvoir avoir deux réglages différents, mais je chipotte

Verpackung & Design Die SUNLU Offizielle Filament-Trocknerbox S4 kommt ordentlich verpackt an und macht einen hochwertigen Eindruck. Die Box hat ein modernes, kompaktes Design, das sich gut in die Werkstatt oder das 3D-Druckumfeld einfügt. Die Verarbeitung ist robust, und die Tür lässt sich einfach öffnen und schließen. Funktionalität & Nutzung Die 4-Spulen-Trocknerbox ist ein echtes Highlight für 3D-Drucker-Enthusiasten. Ich benutze sie, um verschiedene Filamentarten wie PLA, TPU, PETG, ABS und Nylon zu trocknen, und sie funktioniert wirklich gut. Die Temperaturregulierung ist sehr präzise, und die schnelle Erwärmung sorgt dafür, dass das Filament in kurzer Zeit die optimale Trockenheit erreicht. Besonders praktisch ist die automatische Feuchtigkeitskontrolle, die dafür sorgt, dass das Filament stets in der besten Form bleibt. Leistung & Zuverlässigkeit In meiner Anwendung hat der Filament-Trockner die Feuchtigkeit zuverlässig entfernt und das Filament von Anfang an gut getrocknet. Egal ob PLA oder Nylon, das Filament bleibt auch bei längerer Lagerung optimal verarbeitbar. Fazit Der SUNLU Filament-Trockner S4 ist eine hervorragende Investition für 3D-Drucker, die regelmäßig mit verschiedenen Filamenten arbeiten. Die automatisierte Feuchtigkeitskontrolle, die schnelle Erwärmung und das präzise Temperaturmanagement sorgen dafür, dass das Filament stets in Top-Zustand bleibt und der Druckprozess nicht durch feuchtes Material gestört wird. Ein sehr praktisches und zuverlässiges Gerät, das sich definitiv lohnt.