New open box, Unit has not been opened , NO power supply ①【SUNLU Filament Dryer S2】As a leading 3D printing manufacturer, we've invested years of research to develop a product that significantly enhances 3D printing results. Our filament dryer is the great solution, improving the printing effect and optimizing the printing process. ②【Importance of 3D Filament Dryer】Filaments will absorb moisture from the air, especially if they're old or stored in a humid place. Damp filament will cause many printing issues, but a filament dryer can remove the moisture and help reduse these problems. ③【Keep Filament Dry During Printing】SUNLU Filament Dryer can be used as a filament spool holder (storage dehydrator), and can dry filament during printing, thereby improving print quality. This feature is especially important for those who have their 3D printers in humid locations such as basements. ④【Revive Damp 3D printer Filament】 ⑤【Fast Heating and Even Drying】