The Core ONE->Core ONE+ Upgrade Kit contains everything you need to fully upgrade your stock Core ONE 3D printer to the new Core ONE+. The upgrade is supplied as a kit - you need to assemble it yourself. What's New in the CORE One+ The Prusa CORE One+ is the next evolution of our proven workhorse. It integrates key hardware quality-of-life improvements adopted from the CORE One L, combined with all the firmware updates developed over the entire lifespan of the CORE One. This combination delivers the best print quality, smoother operation, and a more autonomous, hassle-free user experience. Key features: Automatic Top Vent Operation: The extruder now automatically opens the vent for low-temp materials (PLA/PETG) and closes it for high-temperature materials, ensuring the optimal thermal environment and creating a true "set-and-forget" experience. Easy Flex Loading: A redesigned filament insertion point makes the process of feeding flexible filaments quick and simple. New Bayonet-Style Spoolholder: Allows you to use various spool sizes. Ready for a direct-feed drybox. Firmware & Performance: Includes all software updates from the entire lifespan of the CORE One, resulting in even better print quality and smoother operation right out of the box.