3D printing process has been proven as a great method for producing prototypes so now it is slowly being applied to small batch production. Designing parts for small batch production has to take into account material, process and construction specific limitations. In this work a condensed review of additive technologies, materials and guidelines for construction is presented. Problem with manufacturing functional polymer sprockets lies in poor toughness and poor high temperature resistance. Spare parts can also be made with additive technology, which can quickly and with low cost replace parts that don't serve their functions anymore.