This paper is focused on the optimisation of additive manufacturing process in order to obtained best quality surface and minimum cost for fit and functional testing. The researches are developed at the Industrial Innovative Technologies Laboratory (Manufacturing Engineering Department from Transilvania University of Brasov) within the PLADETINO (Platform for Innovative Technological Development) interdisciplinary platform. The main purpose of this work is to demonstrate that additive manufacturing technologies (AMT) can be effectively applied for assembly and functional testing. One of the most popular AMT used worldwide is 3D printing (3DP). 3D printing technologies can be divided in the following groups: inkjet printing, fused deposition modelling and polymer jetting (polyjet). This work is focused on applications of polyjet technology.