Print on demand
Print on demand is a printing technology and business process in which book copies are not printed until the company receives an order, allowing prints in single or small quantities. While other industries established the build-to-order business model, POD could only develop after the beginning of digital printing, as it was not economical to print single copies using traditional printing technologies such as letterpress and offset printing.
Many traditional small presses have replaced their traditional printing equipment with POD equipment or contracted their printing to POD service providers. Many academic publishers, including university presses, use POD services to maintain large backlists ; some use POD for all of their publications. Larger publishers may use POD in special circumstances, such as reprinting older, out-of-print titles or for test marketing.
Predecessors
Before the introduction of digital printing technology, production of small numbers of publications had many limitations. Large print jobs were not a problem, but small numbers of printed pages were typically during the early 20th century produced using stencils and reproducing on a mimeograph or similar machine. These produced printed pages of inferior quality to a book, cheaply and reasonably fast. By about 1950, electrostatic copiers were available to make paper master plates for offset duplicating machines. From about 1960, copying onto plain paper became possible for photocopy machines to make multiple good-quality copies of a monochrome original.In 1966, Frederik Pohl discussed in Galaxy Science Fiction "a proposal for high-speed facsimile machines which would produce a book to your order, anywhere in the world". As the magazine's editor, he said that "it, or something like it, is surely the shape of the publishing business some time in the future". As technology advanced, it became possible to store text in digital form paper tape, punched cards readable by digital computer, magnetic mass storage, etc. and to print on a teletypewriter, line printer or other computer printer, but the software and hardware to produce original good-quality printed colour text and graphics and to print small jobs fast and cheaply was unavailable.