When it comes to synonyms for the phrase "printing machines," there are a few options to choose from. One term that is often used is "presses." This refers to the mechanical machines used for printing a wide range of materials, including newspapers, books, and magazines. Another term that can be used is "printers," which is often used to describe the smaller, more modern machines used in homes and offices to print documents and photographs. Finally, the phrase "printing equipment" can also be used to describe the various devices and materials used in the printing process, including ink, paper, and plates. Ultimately, the choice of synonym will depend on the specific context and the type of printing being performed.