The NC-CylinderElf-IV-D mainly focuses on rhombus-shaped thermos adaptation. It can accurately overcome the problem of seamless connection between the multi-faceted surfaces of rhombus-shaped thermoses to achieve seamless printing. Equipped with 6 colors + white + varnish, it ensures the thermos surface has rich and vivid colors—white ink can be used as a base to highlight the pattern layers, while varnish enhances the glossiness. The printed surface is ultra-smooth without any layer lines. Moreover, the ink meets food contact standards, balancing aesthetic appeal and safety.