Home [tdimolding.com] Custom, Plastic, Injection, Molder, Molding, Plastic, Molds, Engineered, Resins, Gears, Wisconsin, Midwest, Quality, Assembly, Prototype, Rapid Tooling, Off Shore Tooling Thermal Plastic Design, Inc. (TDI) is a plastic injection molding and contract manufacturer based in northwest Wisconsin approximately an hour north of Minneapolis/St. Paul. The …