Superior Sealing Performance: Polymaker PolyDryer Box XL 2-Pack, 3D Printing Sealed Filament Storage Box Filament Holder, Sealed Storage for Large Filament Spools, features a high-integrity sealing design verified through water leakage, smoke leakage, and long-duration humidity testing. It delivers sealing performance comparable to the standard PolyDryer Box with no degradation despite its larger internal volume. Print Without Breaking the Seal: The integrated filament feeding system lets you print directly from the sealed box. 3D printing filament routes through sealed airlocks, maintaining the sealed environment during the entire print. No more opening your storage every time you start a job. Always Know Your Filament's Humidity: A built-in hygrometer provides real-time humidity readings, and the included color-changing silica gel desiccant (up to 110g) gives you an instant visual check on moisture levels inside the 3D Printing Sealed Filament Storage box. Built for 3kg Spools: Designed for spools up to 3kg (Ø300 × 118mm), 3D Printing Sealed Filament Storage Box XL reduces spool changes and keeps printing workflows smooth - ideal for print farms and heavy users running large-format or long-duration jobs. User-Centered Design: Easier to carry with an integrated handle, easier to load with a design built for heavy spools, and easier to open with a new latch system. 3D Printing Sealed Filament Storage Box XL is built around real user feedback. Part of the Polymaker PolyDryer Ecosystem: Box XL integrates with the PolyDryer Dry Dock via an optional Dock Adapter (sold separately) for active drying capability. Compatible with 1.75mm, 2.85mm and 3.00mm 3d printing filament diameters. PolyDryer Box XL by Polymaker is a sealed filament storage solution engineered for large 3D printing spools up to 3kg. Featuring superior sealing performance verified through water, smoke, and humidity testing, Box XL helps protect your filament from moisture that causes stringing, bubbling, weak layer adhesion, and failed prints. The integrated filament feeding system allows you to print directly from the sealed box without ever breaking the seal, maintaining a controlled environment throughout your print. A built-in hygrometer and included 110g color-changing silica gel desiccant let you monitor humidity levels at a glance. Designed around real user feedback, Box XL features an ergonomic carry handle, easy spool loading for heavy 3kg spools, and a new latch design for quick access. It supports 1.75mm, 2.85mm, and 3.00mm filament diameters. As part of the PolyDryer ecosystem, Box XL is compatible with the PolyDryer Dry Dock via an optional adapter for active drying capability.