Joen Hwan Ju’s RITI Printer runs on used coffee grounds or tea leaves. To use the eco-friendly device, one places the leftovers in the ink case on the top, inserts a piece of paper, then moves the case left and right and the image is printed. Joen mentions that another perk is that you will get the smell of the beverage, which undoubtedly would be closer to aromatherapy than your basic ink. The idea is nice but we’re not so sure about the time to print and clean-up afterwards. Joen’s prototype is part of core77’s Greener Gadgets Design Competition.
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