A test matrix of 60 samples whose dimensions are 50x10x10 mm suitably placed in the manufacturing chamber have been produced by EBM Technology in order to analyse the influence of the position and of the orientation components with regard to the dimensional accuracy and roughness surface. The samples have been manufactured on 3 level of height (z axis), 4 different orientations, 5 different positions in the xy plane. Roughness measurements and dimensional measurements have been performed and results have been analysed in order to find a relationsheep between the mentioned geometrical features the positions and the orientations of the samples in the building volume.