Your complex plastic molding projects - SOLVED! Design Molded Plastics is a premier custom injection molding company that offers an engineering-focused solution for your most demanding needs. We offer customers full service one-stop shopping from concept to product through part design assistance, 3D printing, tool design, in-house tool construction, molding, automation, part decorating, quality assurance, and assembly. Press sizes range from 88 ton through 950 ton, including two-shot and vertical molding.