polymers Article Thermal, Tensile and Fatigue Behaviors of the PA6, Short Carbon Fiber-Reinforced PA6, and Continuous Glass Fiber-Reinforced PA6 Materials in Fused Filament Fabrication (FFF) Mohammad Ahmadifar 1,2,*, Khaled Benfriha 1 and Mohammadali Shirinbayan 2,* 1 Arts et Metiers Institute...