### 4-Channel Auto Filament Switching Upgraded 4-in-1 system automatically switches between 4 different filaments (colors or materials) on a single extruder, enabling multi-color printing without manual intervention. ### High Compatibility with 1.75mm Filaments Works with all standard 1.75mm filaments including PLA, PETG, ABS, TPU, and composites, compatible with most FDM 3D printers with open firmware. ### Reliable Anti-Tangle & Anti-Jam Design Built-in tension control and locking mechanism prevent filament tangling and backflow, ensuring smooth feeding and stable printing during long tasks. ### Easy Installation & Firmware Support Comes with complete hardware and wiring harness, supports common firmware like Marlin/Klipper, no major modification needed for most open-source printers. ### Large Capacity & Durable Construction Compact yet sturdy 3D-printed housing (345×270mm) with industrial-grade feeding components, designed for long-term use in workshop and studio environments.