Here we have another concept eco-printer, the REENK by Hyo Sun Ahn & Min Koung So. Similar to the Pencil lead printer, the REENK uses the leftover ink from ballpoint pens after they stop working. The only flaws I can see with this design is that you would probably have to buy specific CMYK pens that would probably be more expensive than your avarage ballpoint pen, and when have you ever used a yellow pen? The concept is still a great one though.
Tags: cartridge, Cartridges, concept, concept printer, crazy, empty ink cartridges, Hp Ink cartridge recycling, printer