The Fused Filament Fabrication (FFF) is a well established 3D printing technique, which has found much attention in research over the years. The mechanical properties of structures manufactured with this process have been shown to be highly sensitive to variations in printing parameters. Print speed, temperatures, build orientation, layer height, infill types and more have been studied repeatedly for various materials. Previous research has shown, that the quality of the bond between the individually deposited polymer lines formed during the production process has a significant influence on the resultant mechanical properties [1]. The bonding process it self can be described as a self diffusion process of the polymer chains across the contact interfaces between the polymer lines, taking place at the nanoscale and in time intervals of milliseconds to seconds (depending on the material). This process is primarily driven by the temperature in the material. If the thermal history in the bonding interface as well the materials reptation time (a characteristic material property) are known, the literature [2,3] provides mathematical models to predict the resultant mechanical properties. In this work we aim to illustrate the necessary steps in applying these models for the material Polyamide 6. The main focus lies on the development of a thermal simulation for a simple 3D printed structure, capable of representing the thermal history in the material during the printing process. Special attention is given to elaborating on the importance of accurate material properties and boundary conditions. The measurements and values for all necessary material properties are presented and ultimately the predicted mechanical properties of the material are compared to measurement results.