In recent decades, additive manufacturing technology or 3D printing has attracted the attention of many researchers. This manufacturing method has made it possible to directly fabricate parts of the desired design, to manufacture complex parts that were practically impossible to produce with conventional manufacturing methods, and to reduce the consumption of raw materials. Additive manufacturing has become a suitable method for manufacturing parts in both academic and industrial fields. In this research, the goal is to construct a porous kaolin substrate in order to achieve an ideal ratio of water to clay. Considering the percentage of water and raw material and printing by extrusion method, the optimum percentage is equivalent to 40% water and 60% raw material. Comparing the XRD results showed that the kaolinite phase changed to metakaolin after heating, and the scanning electron microscopy and energy-dispersive spectroscopy results showed the microstructure of kaolinite and metakaolin and its constituent elements, respectively. Also, using the Archimedes method, the density of the samples with three-dimensional structure after heat treatment was measured, which was 2.2, 2.9, 2.4, and 2.49 g/cm3 for the samples heat-treated at temperatures of 1100, 1000, 900, and 1200, respectively.