The Original Prusa MMU3 is our fast, efficient, and easy-to-use solution for printing with up to five filaments at the same time with high speed and low waste. As an add-on for the Original Prusa MK3.9/S and MK4/S, it enables automatic switching between loaded materials. MMU3 is fully supported in PrusaSlicer by an easy multi-material painting tool, and it offers efficient and filament-saving color printing to everybody. This product is supplied as a kit - you must assemble it by yourself! Please note, the assembly manual for the MMU upgrade kit is available in digital form only. Important links: MMU3 Assembly Guide MMU3 Printable Parts