In general, there are two indicators of precision injection molding: one is the accuracy of the equipment, and the other is the mold error. The former represents the comprehensive level of the injection molding machine because it is difficult to compare the size and thickness of the products. The weight repetition error of the general injection molding machine is about 1%. The better machine can reach 0.8%, less than 0.5% is precision machine, and less than 0.3% is ultra-precision machine. The other is the precision of the mold, which needs to be completed by high-precision mold processing equipment in addition to the experience of engineers and technicians. Therefore, first-class mold processing equipment is a necessary condition for precision injection molding.