The Prepeat ink-free printer, as spotted by Coventry University, was demonstrated in 2010. It offers reusable plastic sheets that apply to the paper using heat. No ink, no toner, no nothing. The user can reprint a document 1,000 times. Unfortunately, with a four-figure price tag and no sign of mass market availability, it seems the Prepeat could never quite generate enough heat.
Black and white e-ink screens have found a successful niche as a way to read books without straining the user's eyes. Amazon CEO Jeff Bezos declared in 2009 that a Kindle with a color e-ink screen was "multiple years away." Over a decade later, the color e-ink screen remains obscure.