For multi-shade 3D printing, a daily twin extruder 3D printer, one which features a one mount for the dual nozzles, is sufficient. But don’t assume it to get as fast as an individual extruder 3D printer, considering the additional bodyweight about the print head affects the print velocity. One example https://socialdosa.com/story7863530/5-simple-statements-about-multicolored-3d-printer-explained