Technology for 3D printing allow to create parts with different shapes and directions of inner structures for example: triangles, squares or hexagons. Paper is focused on comparing mechanical properties of composite structure on Onyx base with different density and shape of fill. Specimens were created by 3D printing from composite material Onyx. At creation specimens were used different structures, which allows software of 3D printer Mark Two. Tested specimens are different in density and

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... of inside structure. Aim of paper is find mechanical properties of specimens and compare this properties among each other. From results to determine the most advantageous shape and density of inside structure, which can be used in transport industry and in another sectors of industry.