Dye-sublimation printing involves printing a design onto specialized paper using a printer, then transferring the design to a substrate using heat. It allows for photo-quality prints on items like polyester fabrics, phone cases, and aluminum. The process requires an inkjet printer loaded with dye-sub ink, dye-sublimation paper, and a heat press. When heat is applied, the dyes in the paper turn into a gas and are absorbed into the substrate's coating or fibers. This allows for customized, high-value products to be produced quickly and inexpensively.