Key Features & Benefits: Dedicated Upgraded Extruder – Integrated filament cutter (wear-resistant & easy to maintain) run-out sensor for precise, reliable colour changes and minimal waste Quick Plug-&-Play CFS Connection – Enables auto loading/unloading, RFID recognition, and smart filament relay 16-colour Potential – Connect up to 4 CFS systems (4 slots each) for endless creative possibilities Fast Installation – ~40-minute upgrade with included tools, cables, USB drive for firmware, and step-by-step guide (YouTube tutorials recommended for visuals!) Precision & Reliability – Smooth feeding, accurate switching, and future-proof OTA/USB updates Package Includes – New extruder assembly, chute & mount, motor covers, cable chain, Teflon tube, screwdriver, USB drive (with firmware), cables, and quick guide Compatible Models: Creality K1, K1 Max (2024 with integrated nozzle), K1C, K1 SE (requires Unicorn/integrated hotend — not compatible with split-type nozzles; upgrade hotend if needed) Important Notes: Slight build volume reduction when using CFS: K1/K1C/K1 SE → 220 × 215 × 250 mm; K1 Max → 300 × 295 × 300 mm (stock spool holder keeps original size) Top cover may not close fully after install Firmware update required (included USB drive for first-time; OTA afterward) CFS unit(s) sold separately — this is the installation/upgrade kit only!