The key theme of this book is an exploration of how recent advances across three related scientific fields are intertwined - the developments in metamaterials, the automated optimal design of innovative electronic, electromagnetic and mechatronic devices, and 3D printing. Developments in the field of automated optimal design have enabled the design of innovative electronic, electromagnetic and mechatronic devices, but there is a risk that design uncertainties and fabrication tolerances dictated by conventional manufacturing techniques will limit the practical synthesis and industrial realisation of these novel designs. The solution might be found in new manufacturing possibilities offered by 3D printing technologies and techniques for the fabrication of conductive layers in low and high frequency applications. The book approaches the topic from several perspectives, including the design of 3D fields, advances in shape synthesis, the role of additive manufacturing in synthesising metamaterials and manipulating ferromagnetic materials, and the steps from numerical models to printed mechatronic devices. A final chapter discusses design challenges and opportunities in industrial settings. Led by two expert editors, with contributions from authors with a range of backgrounds across academia and industrial research, this book provides key information for researchers, advanced students and industry professionals in advanced manufacturing, mechatronics, and electrical and electronic engineering.