Amazon is set to significantly expand its digital and on-demand printing capabilities after reupping an existing agreement with Kornit, the Israeli manufacturer of high-speed inkjet printing equipment. Over the next five years, Amazon committed to buying $250 million in existing Kornit products, such as digital printers and inks, and $150 million in "future products." The deal totals $400 million. The move is a big one for Amazon, which has been steadily and methodically building its digital printing capacity over the last several years. Most of that capacity has gone toward its Merch by Amazon service, a print on-demand platform that enables sellers to create and sell custom apparel and other merchandise decorated and fulfilled by Amazon. We've covered Merch by Amazon and two related services—Amazon Custom and Amazon Merch Collab—at length, particularly where they stand in relation to the promotional products industry.