One of the advantages of AM is that it is fast. As a consequence, AM is termed rapid prototyping, rapid manufacturing, and rapid tooling. One of the disadvantages of AM is that it is slow. How can it be fast and slow at the same time? If it is fast, it is not slow, and vice versa. What is the paradox? When AM makes a part, it takes time. This time can be long or short, depending on the time this time is compared with. If, after comparison, it is long, AM is slow. If, after comparison, it is small, AM is fast.