The Coffee Printer by Riti uses an ingenious way to cut down on waste and provide a limitless supply of printer ink: coffee grounds.

It's a concept only at this point, and should only be envisioned for low-volume print jobs since the user has to manually move the coffee cartridge to make the ink print (sort of like a Flintstones printer).

We think the idea has some promise, as long as it doesn't get you caught in a productivity spiral, leading to more coffee consumption, working harder, printing more documents, etc., until you collapse from exhaustion.