The material preferred in additive manufacturing technology 3D printing, which has advanced in current years and has been utilized in the construction sector, is a cement-based mixture. Considering the experimental studies for this mixture, which does not have a definite formulation, the success of the resulting products shows the rheological properties that enable the material to be built. Data on the constructability of the material can be obtained by defining the volume ratios of the resulting samples with the Fuzzy Logic method. For the constructability of the material, a Mamdani type fuzzy model was created and the “CENTROID center of gravity” method was stipulated as the clarification method. While the component material ratios of the cementitious mixture create the fuzzy inputs of the system, static and dynamic yield stresses are reached as fuzzy output values. 15 rules obtained from experimental studies that enable the system to work were defined and then the operation of the method was tested. In this study, it is aimed to develop a decision mechanism for intermediate values that are not encountered in the experimental results by blurring the mixture models supported with definite findings.