a multi - cavity coinjection mold having a relatively large plurality of cavities for simultaneously molding a relatively large plurality of multi - layered articles including a ) a plurality of cavity groups each defining a relatively small plurality of said cavities , a single balanced hot runner for supplying said relatively small plurality of cavities with contiguous different plastics materials , and a valve for sequentially supplying desired contiguous quantities of the plastics materials from plastics material sources , common to all of said groups , to the balanced hot runner ; and b ) a hot runner manifold system connected to the plastic material sources to supply the plastic materials to all of the valves ; and related methods .