Choosing Between SUNLU Filament Dryers: S4 vs S1 for Your 3D Printing Needs
When it comes to 3D printing, filament quality is paramount, and moisture can wreak havoc on your prints. With two popular options from SUNLU, the S4 and S1, makers are faced with a crucial decision. This comparison breaks down their features, performance, and value to help you choose the best filament dryer for your setup.

SUNLU Official Filament Dryer S4, 2026 Newest 3D Printer Filament Dry Box, Upgraded 4-Spool Filament Dehydrator, Auto Humidity Control, Fast Heating, Temperature Balance, Filaments Storage Box

Dryer Box of 3D Printer Filament, SUNLU 3D Filament Dryer Box S1, Keeping Filaments Dry During 3D Printing, Filament Holder, Compatible with 1.75mm, 2.85mm, 3.00mm Filament, Storage Box
Our Recommendation
The SUNLU S4 stands out as the superior choice due to its advanced features, including auto humidity control and a larger capacity for multiple spools. These enhancements lead to better filament preservation and overall print quality, making it a worthwhile investment for dedicated makers.
Detailed Comparison
Display
Both the SUNLU S4 and S1 feature simple interfaces, but the S4 offers a more advanced digital display that provides real-time humidity levels and temperature settings. This allows for precise control over your filament storage conditions. The S1 has a more basic indicator light system, which is functional but less informative. Winner: S4 for enhanced monitoring capabilities.
Performance
The S4 is designed for serious users with its auto humidity control and fast heating capabilities, making it suitable for larger batches of filament with its 4-spool capacity. The S1, while effective, only holds one spool and lacks automatic features. This means the S4 can maintain optimal conditions for longer periods without constant monitoring, leading to better filament preservation. Winner: S4 for superior performance.
Build Quality and Design
The S4 is built with a focus on durability and efficiency, featuring a robust design that can handle the demands of continuous use. It also has better insulation to maintain consistent temperatures. The S1 is compact and lighter, which might appeal to those with limited space, but its build quality feels less sturdy compared to the S4. Winner: S4 for superior build quality.
Price and Value for Money
Here’s where the S1 shines: at £29.99, it’s a budget-friendly choice that’s appealing for beginners or casual users. Meanwhile, the S4 is priced at £99.99, which might seem steep but reflects its advanced features and larger capacity. If you’re serious about 3D printing and plan to use multiple filaments regularly, the investment in the S4 could pay off in better print quality over time. Winner: S1 for budget-conscious makers.
Overall User Experience
User reviews generally highlight that both products perform well, but the S4 gets more praise for its ease of use, efficiency, and the peace of mind it provides with its auto controls. The S1 is praised for its simplicity and effectiveness, but users report needing to monitor humidity levels more frequently. The S4’s advanced features make it a more user-friendly option for those looking to streamline their workflow. Winner: S4 for an enhanced user experience.
Summary
In summary, the SUNLU S4 offers advanced features and better performance, making it ideal for serious 3D printing enthusiasts. On the other hand, the S1 is an excellent budget option suitable for newcomers or those with less frequent printing needs. Your choice ultimately depends on your commitment level to 3D printing and how much you value features like automation and capacity.
Buy the SUNLU Official Filament if...
Choose the S4 if you're a frequent 3D printer looking to maintain optimal filament conditions with minimal effort. Its advanced features make it ideal for keeping multiple spools dry and ready for high-quality prints.
Buy the Dryer Box of if...
Opt for the S1 if you’re just starting out or printing occasionally and need an affordable solution. It’s a solid choice for those who are budget-conscious and don’t require the high-end features of the S4.
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