Announced today and now available in the 123D Sandbox you can design circuit board designs for free using the new 123D Circuits (http://123d.circuits.io/). Now you can not only design your 3D robot using 123D Design, but also what powers the robot and that is the electronic circuits that interface with perhaps an Arduino. But you say “Shaan I don’t have the ability to produce the physical board I design for my robot,” no problem as you can get your design manufactured and shipped to you.
Video Overview of 123D.io: http://vimeo.com/73973905
123D Circuits is a revolutionary free tool for designing your electronic projects online. You can design in a familiar breadboard view and the app will guide you to make professional printed circuit boards with built in layout tools. When you’re done just click to have your boards professionally manufactured and shipped for free worldwide.
What’s also cool is how you can easily, simultaneously work on the same circuit with your friends. And at any point you can compile and emulate your Arduino code inside a live, editable circuit!