Tinkercad

Tinkercad allows you to design 3D models of various objects and materialize them by using 3D printers. If you have a 3D printer, you can download the STL file containing your design and print it right away. Or you can send your design directly to one of integrated 3D printing service companies (Shapeways, Sculpteo, i.Materialise and Ponoko). Working with the Tinkercad editor is quite simple. There are also interactive lessons available for beginning users. You can start from scratch or modify the thing that someone else has designed.