What are the main factors that affect precision injection molded products?

Generally, precision injection molds have two indicators, namely equipment accuracy and mold error. The former is difficult to compare due to differences in size and product thickness, representing the comprehensive level of injection molding machines. Generally, the weight repetition error of ordinary injection molding machines is about 1%, and better machines can reach 0.8%. Precision machines are considered precision machines if less than 0.5%, and ultra precision machines are considered ultra precision machines if less than 0.3%. So, what are the main factors that affect precision injection mold products?
1. Consider the shrinkage rate of plastic.
2. The shape and size of a plastic part.
3. The precision of the molded parts and their mold processing accuracy.
4. Injection molding machines have high precision requirements for products.