This paper discusses the results of static tensile test of rectangular cross-section specimens made of a photo-curable material–FullCure 720. The specimens were prepared applying an incremental shaping method with the use of PolyJet technology. An analysis of the results was conducted and uncertainty in the measurements of tensile strength was estimated. Direction of specimens on a working platform of the machine was taken into account. The occurrence of anisotrophy of mechanical properties of the materials depending on the direction of the elements on the working table of a 3D printer was confirmed.