Who is mayco international? Global Tier 1 supplier. Mayco International is a global Tier 1 automotive supplier to the automotive companies. We use the latest technologies, materials, and concepts to provide our customers with state of the art interior modules.Where does mayco make its molding? In 2017, Mayco International opened a new production facility in San Luis Potosi, Mexico. This plant specializes in light-weight compression molding and injection molding for automotive OEMs and is ISO and IATF certified.Why choose mayco slp hydraulic injection molding machines? At Mayco SLP we have all new hydraulic injection molding machines that are designed for the highest levels of precision molding. Thanks to an intelligent energy management system, our machines run at maximum efficiency.