This design is by Markus (Traumflug) Hitter and should be of particular interest to the RepRap side of 3D printing. RepRap stands for Replicating Rapid Prototyper because Dr. Adrian Bowyer’s project was focused on creating a machine that could more-or-less reproduce itself. We have the RepRap project to thank for the recent explosion in amateur interest in 3D printing and it was the RepRap’s self-reproducing feature that made the explosion possible. The more parts the machine can make, or process, on its own the easier it will reproduce. Traumflug’s Gen 7 electronics are simple and single-sided, so the board can be milled on a suitably equipped RepRap.
You can buy the electronics from Traumflug or find the files at github