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Printing path and the printing process for different models. (A) Printing path. (B) The printing process, where 1 refers to nozzle 1 and 2 refers to nozzle 2; the process of the first printing method is 1-2-3-4. (C) The printing process, where 1 refers to nozzle 1 and 2 refers to nozzle 2; and the process of the second printing method is 1-2-3-4.
