Fused Deposition Technologies (FDT) are additive manufacturing methods that create 3D parts using an extruded filament to add sequentially 2D layers in the vertical direction. The technology is considered as disruptive, since it allows to obtain parts with intricate shapes and good properties at reduced costs. However, currently the quality of the parts is often disappointing with respect to dimensional accuracy, surface quality and mechanical performance. It has been demonstrated that these attributes are strongly influenced by the development of the filament temperature during deposition and cooling. Previously, the authors developed a computer routine that models the transient heat conduction developing during filament deposition and cooling, whilst considering the relevant contacts at each time step. In addition, the degree of bonding of all pairs of adjacent elements was computed adopting a healing criterion [1,2]. In this work, the code is used to study the effect of process parameters on the evolution of temperature and the resulting adhesion quality. It is shown that use of the software developed can create some general guiding rules on part design and printing conditions in FDT. [1] S.F. Costa, F.M. Duarte, J.A. Covas, Virtual Phys. Prototyp. 10 (2015) 35 [2] S.F. Costa, F.M. Duarte, J.A. Covas, J. Mat. Proc. Technol. 245 (2017) 167