In this paper, the mechanical properties of poly lactic acid - polylactide (PLA), acrylonitrile butadiene styrene (ABS) and polyethylene terephthalate glycol-modified (PET-G) polymeric materials were tested in Istrian university - Università Istriana di Scienze Applied within the Center research of the METRIS from Pula which can be used for manufacturing mechanical elements. The mechanical properties of strength, hardness and impact fracture of the material were tested, and the best material was selected based on the results obtained. In this paper, a machine for processing materials by removing particles was constructed. The focus of the work is on the design and calculation of the reducer. The reducer was made using additive technology. Reducers and 3D printing find application in various branches of industry. Gears, shafts, housings and other parts of the reducer can also be produced from polymers with good mechanical properties such as strength and toughness. Polymeric materials have 10-15 times less strength than structural steel. When designing the reducer, the dimensions of the gears, shafts, bearings and casing were calculated according to norms and standards. It is necessary to construct the product in accordance with the requirements of the profession and financial profitability. The process of making polymer products using additive technology can compete with steel if it involves low loads on the machine element. Gears made of polymer materials are not widely represented on the market, but they exist and are applicable in various industrial systems. Additive materials are still in the process of research and development, such as improving the properties of strength and elasticity so that they can be used in industry and production facilities.