A few months ago, after having built the Printrbot Simple, I was browsing the Printrbottalk forums and came across a rather interesting post by JohnSL. John had modified the RichRap 3DR design to allow it to be built with the components available from the Printrbot Simple. Specifically, the design reused the most valuable components from the Simple: four stepper motors, the Printrboard and Ubis hotend. Continue reading…