In computing, a printer is a peripheral device which makes a persistent human-readable representation of graphics or text on paper.The first computer printer designed was a mechanically driven apparatus by Charles Babbage for his difference engine in the 19th century; however, his mechanical printer design was not built until 2000.
The first commercial printers generally used mechanisms from electric typewriters and Teletype machines.
In the 1980s were daisy wheel systems similar to typewriters, line printers that produced similar output but at much higher speed, and dot matrix systems that could mix text and graphics but produced relatively low-quality output.The plotter was used for those requiring high quality line art like blueprints.Źródło: https://en.wikipedia.org/wiki/Printer_(computing)
Because you need to build brand awareness at the customer, i.e.printing and marketing is an inseparable couple. Because you can print everything on your T-shirt and have it originally. Well, who would prohibit the rich?
This is a very convenient solution, because you can immediately overcome mistakes made by potential customers when placing an order. Often, they send a bad file in the wrong format, with the web printing this error is still captured by the script itself accepting the order.