Folks over at House4Hack in Johannesburg are developing an app, called Paint3D, that will allow you to sketch and print directly to a 3D printer from your Android device. Their app allows you to create an extruded polygon mesh that’s then converted to GCode, stored on an SD card, and fed to the printer. Their goal is to create an easy to use 3D tool that does everything from the Android device. [Thanks, Daniel!]