For multi-colour 3D printing, a regular dual extruder 3D printer, one which contains a one mount for the twin nozzles, is sufficient. But don’t expect it being as rapidly as an individual extruder 3D printer, taking into consideration the additional excess weight about the print head affects the print speed. https://milozyulz.blogerus.com/52363550/multicolored-3d-printer-fundamentals-explained