Abstract: The authors consider a geometric model of a thermal board based on actual data obtained using the methodology of adaptation to additive manufacturing technologies of heat exchangers. The question of solving the problem of finding the most effective thermal card option by the computational method among the selected options is investigated and a comparison is made with the experimental sample made by the additive technology method to verify the selected method for obtaining computational data. The authors analyze 62 selected options for thermal boards, with the adaptation of the computational grid in the thermal board matrix. For testing, a special installation was assembled and samples were made on an EOS M290 printer. The main research methods used in the work: computational and comparative-analytical methods to obtain data on the selected options and determine the effective sample, as well as experimental to verify the data.The novelty of the study lies in the development of an effective geometric form of the thermal board and the manufacture of the selected sample by the method of additive technologies. The selected geometric model of the thermal board is manufactured using the additive technology method at the lowest cost, the rods and bases of the thermal board are self-supporting elements that do not need support. The results of research tests of a prototype thermal board confirm the correctness of the selected calculation method for determining the effective design of a thermal board manufactured by the additive technology method.