Check the listing for details. SUNLU New Filament Dryer Box S4 Large Capacity 3D Printer Filament Storage. Condition: New. Listed at 127.99 USD. SUNLU Filament Dryer Box S4, New Generation 3D Printer Filament Dryer, Large Capacity Filament Drying Box,Auto Moisture Control, Fast Heating, Temperature Balancing, Filament Storage ①【Large space for endless printing】Experience uninterrupted 3D printing with SUNLU's new S4 Filadryer – the first filament dryer box to effortlessly handle 4-coil 1 kg 3D printer filament simultaneously. With the new generation filament drying box, we can enjoy the freedom of multi-color and multi-machine 3D printing.②【Improved lightning fast heating】With the impressive 350-W PTC heater of S4 filament drying box, you can heat up faster. It heats up from 25℃ to 50℃ in just 30 minutes, providing 50% faster and more efficient heating than other filament dryer boxes on the market. Efficiency meets speed for a next-generation 3D printing experience. ③【Triple security for worry-free printing】Rest assured, because in the S4 filament storage box, your safety comes first. Its three-layer security – PTC, temperature switch and software protection – keeps an eye on temperatures and ensures a worry-free 3D printing environment with real-time alerts for unexpected changes.④【Triple fans for even drying】SUNLU new Generatio S4 filament dryer, equipped with three built-in fans – two circulating fans on the sides and one on the bottom. It ensures a temperature balance within the box of ±3℃ ensuring optimal drying for each section of the filament. Save your wet filaments efficiently. ⑤【Auto Humidity Control】3D printer users can adjust the internal humidity in "mode 2" (30% to 50%). The S4 dryer automatically starts drying when the humidity reaches the desired range, ensuring that your filament remains dry. At less than 25% the drying stops to prevent excessive drying of the filament.