Der Kritzler (by tinkerlog) via TechCrunch

“…It’s put together from mostly off-the-shelf parts (Arduino-powered, naturally), though it’s far from simple. The process uses vector graphics and turns it into a tone map, and given a known starting point for the pen, it “prints” by moving the pen along rows and adding jitter to darken the “pixels” to whatever degree is necessary. It looks like it has about four discrete tones it can make — not the greatest range, but in aggregate it works quite well.

You can read how it was put together at the creator Alex Weber’s blog, and he has also put the source, documentation, and so on up on Github…”