The RITI printer design concept by Jeon Hwan Ju takes your coffee or tea dregs, plus a little elbow grease, and turns them into an eco-friendly alternative to conventional ink.

BY 2017 printing presses around the world will lap up 3.7m tonnes of ink, worth some $18 billion. Most of it will contain hydrocarbon-based solvents resulting in emission of volatile organic ...

Objects printed using this ink contain as much as 97.5% metal, making them highly electrically conductive. If these objects are left to dry at room temperature, they retain their initial shape.

It's the Ecofont - a free font that's based on Verdana, but drilled with holes so it uses less ink when printed. It's a curious approach to making your printer more eco-friendly (and cheaper).