Here are the results of some calculations based on the PVT diagram for unfilled polycarbonate. This graph shows the effect of packing pressure on shrinkage. Increased packing pressure causes a decrease in shrinkage. This graph shows the effect wall thickness.
Thicker parts experience greater shrinkage.
Gate thickness also has an effect on shrinkage. Usually, the gate thickness is about half the wall thickness. Melt temperature does not have much of an effect on shrinkage. Mold wall temperature affects shrinkage because it determines the cooling rate. Increased mold wall temperature leads to decreased cooling rates and increased shrinkage.