In recent years, applications of 3D printers has grown because of the need for more complex forms, at lower costs and faster speeds. In the concrete industry and constructions with high geometric complexity, using 3D printer can reduce amount of used concrete and accelerate production speeds and reduce production costs as compared with conventional methods. Particle_bed method is the one of the most important methods for 3D printing of concrete. In the first part of this study, in order to obtain formulation of effective parameters on three-dimensional printing process of concrete, theoretical analyses and correction of parameter and formulas that affect the behavior of concrete, such as concrete grading and materials percentage in concrete, such as cement percentage and sand percentage are discussed. In the following in order to investigate the parameters affecting the particle bed wetting pattern, such as water to cement ratio, sand to concrete ratio, nozzle distance from the bed, head velocity, concrete grading and pressure applied to layers, experiments were designed and carried out and the results have been reported. Then 2D and 3D concrete printing machines were desined and made to print 2D and 3D concrete element. Finally, in order to print three-dimensional constructions, corresponding G-codes were extracted by Cura software and the prepared G-codes were adjusted and modified to match the desired printing process. At the end, 3D concrete parts are made by the manufatcured printing machine. Keywords : Concrete 3D printer, Particle bed method, wetting pattern