Greener Gadgets Design Competition aims to promote the creation of new gadgets that have an emphasis on being green. The top 50 entries are now online to be voted for by the general public. Jeon Hwan Ju from Korea, his RITI printer works by replacing environmentally un-friendly inkjet cartridges with the dregs from your daily coffee. Simply place used grounds in the ink case, insert a piece of paper, and move the ink case left and right to print text.
The RITI printer is an eco-friendly printer based on the concept of a new ink system. It uses coffee or tea dregs. The user places the coffee or tea dregs into the ink case located on the top of the printer, then insert a piece of paper in the middle. Moving the ink case left and right will print your image, and as you draw on the paper, dregs inscript on the paper just like ink.
Source: Cool Design Concept + Ideas.