3D Printing is the process of making a solid object from a digital design. The design is created on a computer using 3D software like Blender. The completed design can be sent directly to a 3D printer if you have your own or to a service like Shapeways which allow you to upload the design to their web site which they will then print and mail to you. The 3D printer creates the solid object by printing thin layers of a material on top of each other until the design is complete. Various materials can be printed including plastics, metals and ceramics.