Additive manufacturing, also called rapid prototyping or 3D printing is a disruptive manufacturing technique with a significant impact in electronics. With 3D printing, bulk objects with circuitry are embedded in the volume of an element or conformally coated on the surface of existing parts, allowing design and manufacturing of smaller and lighter products with fast customisation. The book covers both materials selection and techniques. The scope also covers the research areas of additive manufacturing of passive and active components, sensors, energy storage, bioelectronics and more. The book presents the most important developments to date in the field of additive manufacturing of electronics in its broadest sense, using various functional materials and techniques. The elements presented here are organized in a workflow starting with a description of the additive manufacturing approach, an interesting and quickly developing printed electronic technology, an alternative approach to fabrication of structural electronic circuits, adaptation and application of various materials for additive manufacturing of electronics and ending with challenges and the perspective being in front of presented here domain. Of course, the main and largest part of the book deals with examples of additive approaches to the fabrication of structural electronic components and circuits, covering the scope of conductive materials and basic passive elements, active components with semiconductor materials, photonic components and systems, energy storage devices, a vast area of sensors and micro-electromechanical systems. All this fulfills the book’s main goal of presenting potential solutions and possible practical applications of additively fabricated structures for electronics.