Shenzhen Alu Rapid Prototype Precision Co., Ltd. Industry News Home News Prototype Plastic Injection Process Overview A mold, typically made from aluminum or soft steel for prototyping (to reduce costs), is designed based on the part’s 3D CAD model.Plastic resin (e.g., PLA, ABS, PP, or PC) is melted in an injection molding machine and injected into the mold under high pressure.The plastic cools and solidifies in the mold, forming the prototype part, which is then ejected.Cycle times are short (seconds to minutes), enabling rapid production of multiple prototypes