The purpose of the feed system is to convey the polymer melt from the molding machine to the mold cavities. The design of feed systems can range from very simple to very complex. Increased investment in the feed system design will tend to provide for reduced cycle time and less material waste when using the mold. However, it is possible to over-design the feed system, and the “best” feed system design is a function of the production volume, availability of molding pressure, and level of allowable investment.