The Prusa MMU can switch between 5 filaments, the CoPrint up to 7, the Mosaic Palette up to 8, the ERCF up to 12 (enraged rabbit carrot feeder), in the future there may be even more. The Swapper3D supports "UP TO" 25, but it will work with 1 or 2 or 5 or 8...all the way UP TO 25. When users purchase the base Swapper3D kit it comes with 5 QuickSwap-Nozzles and it can be expanded by adding more at any time in the future. The ‘up-to’ 25 nozzles can also be used to automatically switch different nozzle sizes during the print even when printing with a single filament.