The thickness of the wall depends on the external force to be borne by the product, whether it is used as a support for other parts, the number of columns to be borne, the number of projections, and the selection of plastic materials. The wall thickness design of general thermoplastic should be limited to 4mm. From an economic point of view, product design with excessive thickness not only increases material cost, prolongs production cycle (cooling time), but also increases production cost. From the point of view of product design, excessive thickness of the product leads to the possibility of producing holes (pores), greatly weakening the rigidity and strength of the product.

The ideal wall thickness distribution is undoubtedly uniform thickness in every section, but it is inevitable that the wall thickness will change in order to meet the functional requirements. In this case, the transition from thick rubber to thin rubber should be as smooth as possible. Too abrupt wall thickness transition can lead to dimensional instability and surface problems due to different cooling rates and turbulence.