When designing a product, what must be considered is to conform to the application scenario. The key to portable printing lies in its changeable use scenarios and many unexpected situations. It is necessary to start with better protection effects such as anti-fall, shockproof, and waterproof in order to make the product more in line with the attributes of portable mobility. Through the two-color injection molding process, the shell surface of the product is fully covered with glue and 360 degrees without dead angle protection, so that the whole protection level of the product is raised to IP54. In a simple form, the visual level on the outline is highlighted, the visual order is emphasized, and the visual feeling of exquisite and delicate industry is presented. In product design, the content that must be considered is to conform to the application scenario. The key to portable printing lies in its changeable use scenarios and many unexpected situations. It is necessary to start better protection against falling, shockproof, waterproof and so on, in order to make the product more compatible with the properties of portable mobile. Through two-color injection moulding process, the product shell surface is covered with glue, 360 degree dead angle protection, so that the product protection level is raised to IP54. In a concise form, the visual level on the outline is highlighted, the visual order is emphasized, and the visual feeling of exquisite and delicate industry appears.