The Dobot Magician is a wonderful educational robot capable of 3D printing, laser engraving, and performing other tasks. It already comes with a whole host of features for you to get started. The Robot Vision Kit lets you integrate a vision system for sorting applications.
Source code is provided, so you can start learning faster. The kit consists of an extension rod, lighting source, calibration board, industrial camera and lens, and various other components. The above videos show what you can do with it.