3D printing is getting attention in manufacturing industry recently. However there are still many supplement points for the application to industrial parts. There are several types of 3D printing method according to additive way, which are FDM, SLA, DLP, SLS, Polyjet, and so on. FDM type uses filament. Continuous filament with circular cross-section is fed into a barrel and is melted when it passes a nozzle which is heated by heating block. Melted filament is extruded through nozzle and it makes layer. Additional melted filament put on the previously made layer and this process makes three dimensional object. Layer strength in the 3D printed object is weaker than bulk material. Layer strength is dependent of tool path, nozzle temperature, nozzle moving speed, and so on. In this paper, layer strength has been examined according to nozzle temperature for PLA, PA6, and ABS filaments. Layer strengths for orthogonal direction to deposition are weaker than deposition direction by 27.9~50.3% according to filament material. Layer strengths for the deposition direction in 3D printed article have 50.2~95% of strength of bulk material. Layer strength for the orthogonal direction to deposition strongly depends on nozzle temperature and increases as nozzle temperature increases.