Textbook in PDF format This book describes several post-processing techniques that can be used to enhance the mechanical strength, isotropy, surface quality, and dimensional accuracy of 3D printed components using the Fused Deposition Modeling (FDM) technique. It also discusses the usage of adhesives, interlocks, fasteners, ultrasonic, frictional, and microwave energy to join FDM-3D printed parts. Furthermore, the book also covers the scope of future research and challenges in the post-processing of FDM parts, as well as some of the most popular approaches in the field, such as Big Area Additive Manufacturing (BAAM), Machine Learning, and Internet of Things (IoT)