Xiaomi mi A1 MultiColor back with 1 nozzle

Xiaomi mi A1 MultiColor back with 1 nozzle. Its super simple you just put one color on the printer as always and print one of the parts, then change the color and print other part, and finally the case. All this steps with out touching anything on the bed. See this amazing video https://www.youtube.com/watch?v=KV2AjyowXX4&t=219s .