Additive manufacturing – most commonly referred to as 3D printing – offers exciting new possibilities for the creation of physical objects. It allows object geometry to be specified (“drawn”) in purely virtual form on the computer, and then realized in physical form seemingly “at the push of a button”. As a result, it enables both rapid prototyping of physical forms and new forms of mass customization not previously practical. Further, some of these systems offer the ability to create new forms which are difficult or impossible to manufacture in other ways, opening up new