**4. Conclusions**

In the context of the trends and challenges that were presented in this chapter and based on the opportunities that exist in the Rapid Prototyping (3D printing) domain as were presented in this chapter, the current book aims to present few of the most important results that were reached in the 3D printing domain by researchers coming from different prestigious universities all over the world. The character of the researches presented in the book is inter and transdisciplinary, providing anyone who is looking to develop new researches in the field of 3D printing (PhD students, researchers, engineers, etc.) a good starting point for this purpose. The applications presented in this book are very large, covering a wide spectrum of 3D printing methods that were successfully used for the developing, testing, and producing different components that were further successfully used in the industrial and medical fields in the last years.
