Photopolymer material preparation process and the device system with application in DLP (Digital light processing) 3D printer include a system for maintaining a constant liquid level (1, 11, 12 and 13), the roller (8) and the saturated liquid (19) in the container (1) in which the 3D model (2) is printed. This invention relates to a method and a complete process for photopolymer material (4) preparation when printing a 3D model (2) on DLP 3D printers. Elements of the system specified above form a whole and thus result in the most effective impact on solving the technical issues present so far in 3D printing with DLP technology. The application of this complete procedure enables higher 3D models (2) printing speeds, higher precision of printed 3D models (2) is achieved, and ultimately reduces the cost of making 3D models (2) printed using DLP 3D technology. According to this invention, there is a possibility of continuous printing, without interruption, with constant repeatability of printed 3D models (2). And, what especially emphasizes the advantage of this invention, it is the possibility of quality and precise printing of 3D models (2) of unlimited dimensions. The application of this invention solves the existing technical issues in 3D models (2) printing using DLP technology, which are: pigment deposition (6), the need for mixing the photopolymer (4), cooling the photopolymer (4) and maintaining a constant distance between the projector (3) and the photopolymer surface (22). The end result of the application of this invention, and taking into account the solutions of present technical issues, is the contribution of this invention to faster, more accurate, cheaper printing of 3D models (2) and possibility of 3D models (2) printing of unlimited dimensions.
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