Plastic Parts, Inc. | Home Plastic Parts Inc. is a plastic injection molding company offering a complete design and manufacturing process that is a turnkey solution for manufacturers in a wide range of industries. Providing Ame Plastic Parts Inc. is a plastic injection molding company offering a complete design and manufacturing process that is a turnkey solution for manufacturers in a wide range of industries. Providing American made plastic injection molded parts including thermoplastic molding, scientific molding technologies, custom plastic molding, insert molding, over molding and gas assist, part assembly, welding & pad printing for plastic injection molded parts for Wisconsin and the Midwest United States.