Printing is the process in which the ink is transferred from a custom designed ink pad to the product which is to be printed through rollers. There are various types of printing processes for plastics like dry offset, letterflex, flexographic, letterpress, gravure and gravure offset.

Rollers with ink paste transfers the ink to the blanket cylinders made of rubber like material. The blanket then contacts the part one time thus transferring all the colors simultaneously to that part.
Raised and Depressed Letters :

Molded plastic parts can have raised or depressed letters. Depressed letters on the plastic parts are more expensive because during the process of making molds the material is etched or machined around the letters which increases the cost of machining. Whereas in raised letters on the plastic parts the mold is made by etching or machining only the letters which is a cheaper process.