Book excerpt: 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). Features: • Covers all necessary details related to post-processing of Fused Deposition Modeling (FDM) parts. • Provides an overview of various joining techniques for 3D printed FDM parts. • Focuses on the latest developments related to sustainability and optimization in post-processing of FDM parts. • Includes microwave joining of 3D printed parts. • Reviews case studies on cutting edge research, innovation, and development aspects. This book is aimed at researchers and graduate students in additive manufacturing, materials science, as well as manufacturing engineering.