Simulation methodologies were developed, in the case of the sintering modelling, or adapted, for the injection moulding behaviour of ceramic and metallic feedstock, in order to provide sophisticated user friendly and customisable tools for the process set-up. A brand new code was developed to simulate all sintering diffusion mechanism and, thus, the shrinkage of both metallic and ceramic injection moulded parts. After the characterisation of binders and feedstocks, suitable FEM-based methodologies were used to study the best injection conditions and mould parameters. Reliable results were achieved for the evaluation of macroscopic shrinkage behaviour and residual stresses of sintered 3D real geometry components thanks to the development of a FE model. Then these methodologies have been applied to the design and the manufacturing of the project mock-ups, in order to check their reliability.