Since about 2013, it had been experiencing the boom that is the manufacturing using the three-dimensional printers called “Additive Manufacturing”. Even among them, “fused deposition modeling (FDM)” type of printers are inexpensive, so they are becoming popular in a general office and a home. Poly lactic acid (PLA) and Acrylonitrile-Butadiene-Styrene (ABS) are the famous resins used for FDM type printers. The characteristics of PLA are shown below: ithe shrinkage is small when cooling time, and it is the biodegradable resin. On the other hand, as compared with ABS, PLA has defects of the impact resistance and the heat resistance. The molding products made by FDM-type 3D printing using PLA filament have same demerits. So, we attempted to improve by making and using composite filaments composed of PLA and fillers. In this study, the PLA composite filaments included cellulose or carbon nanotube were produced by a twin-screw extruder. Then, three-dimensional printing was performed using the composite filaments. After that, the comparison was performed which was between pure PLA filament and PLA composite filament about the characteristics of the molding products.