The book's authors take the reader through the basics of what the FDM technique is all about and describe the advantages and new opportunities arising from 3D printing innovative materials, which include polymer-matrix composites and fully inorganic parts. They then review and discuss methods for making the different types of composite feedstock filaments needed to 3D print such materials by FDM. Finally, sections discuss the challenges that should be considered in making filaments and parts and how to go about solving them.