Current 3D printing system employs STL as input file format. When slice data is generated from STL file, surface and internal area are divided and simple support structure is applied to internal area. However, this data processing is not suitable for characteristics of 3D printing, which can form complicated heterogeneous objects. In this research, assuming single material printing, a method of designing internal structure of 3D printed model with 3D dithering is developed. Through this research, it is revealed that material properties of 3D pretend model, such as transparency and softness, can be controlled by designing internal heterogeneous structure.
