Additive manufacturing or extrusion-based 3D concrete printing (3DCP) is a quickly developing construction method that brings advantages over the above traditional concrete casting [1]. For effective and successful 3DCP, the mixture composition must be carefully selected and adapted to specific printer parameters. Such additives as superplasticizers, viscosity modifiers, supplementart cementitious materials, and inclusions as thixotropic agents, retarders, accelerators, and fibers must be considered [2]. 3DCP technological variables such as water-cement ratio or print-head nozzle size needs to be determined, as they influence the size of the printed object and the total open printing time. Besides that, the properties of the binder itself and its hydration characteristics must be investigated. This all affects rheological aspects and curing dynamics of concrete as well as determine the quality of the printed structure. A group of models was developed to analyze 3DCP parameters regarding concrete printer print-head nozzle size and consistency of printed concrete. The models were based on 3DCP squares with linear printing patterns. The impact on fresh and hardened concrete properties was tested based on this analysis method. An effort to determine an optimal combination of precise requirements for setting time, fresh concrete consistency, strength and shrinkage was performed. The consistency of fresh material is the key to ensure that initial tests are carried out, which include printing and testing 3D concrete mixtures. The material consistency by table flow method should be between 180 mm and 200 mm to ensure that the mass of 3D concrete is printed with the required mass viscosity to allow its extrusion.The results indicate the change of the mechanical properties regarding the print-head nozzle size and consistency of concrete. Drying shrinkage up to 0.26% was detected at the age of 26 days. Printing quality between top and base layer ratios from 0.53 to 0.98 was reached.