Note: CFS is currently only compatible with the K2 Plus; Not compatible with flexible TPU, damp BVOH/PVA, or warped cardboard filament spools. To ensure seamless integration of your CFS unit with the Creality K1/k1max/k1c/ender series and so on, you will need the official connection kit. Up to 16 Colors, Level up Your Creativity: Each CFS unit can hold 4 1kg rolls of filament, and you can link up to four units together to use 16 rolls at once. Moisture-proof Filament Storage. Auto Filament Identification| Mapping| Switch & Relay. Sensors for Advanced Intelligence: Filament affairs are now automated to your delight.