3D printing allows for rapid prototyping and production of objects without the need for assembly. The document outlines the 3D printing workflow from an initial idea through 3D design, making the design printable, printing the object, and enjoying the finished product. It emphasizes how 3D printing enables quick, inexpensive production of parts without the use of fasteners like glue, screws or tape. Examples given include printing a gear in 8 minutes for 8 cents and a pinion in 3 minutes for 3 cents. The ability to self-lock components without fasteners is described as priceless. The document encourages prolific conceptualization, adaptation, evolution, and re-printing to compress the development process.