Technique of 3D printing is a technique by which, with a special method of two-dimensional printing, can be constructed a three-dimensional object. 3D ink jet printing is based on the conventional ink jet printing process, which is very common in printing technology. As the basic materials are often used powder (instead of two-dimensional surface) and a liquid binder (such as color). Objects are being created by induration of multiple successive layers, cross-object. Printing of so-called 3D objects is widely used, and the need for them is growing more and more, in proportion with the increasing availability for these techniques. The primary purpose of this technique is rapid production of prototypes. Along with this technology, there are still some other technologies that we use for rapid production of prototypes and ready-made tools in smaller series, and they are reduced to a common name for additive manufacturing. In this presentation will be described the basic process of making a 3D object and mode of working of important elements of the machine. There will be compared several similar machines and their technical characteristics and also described the basics of the other methods of making 3D objects. Furthermore it will be specified some constructive characteristics of 3D printing machine that one must fulfill and it will be given several suggestions for improvement of the current machine.