Abstract <p>The paper demonstrates for the first time the possibility of using an unalloyed tungsten powder with a spherical particle shape from 5 to 45 μm with a grain size of 0.5 to 2 μm obtained using plasma chemical synthesis, granulation, and spheroidization technologies to create products using additive technologies. The influence of the technological parameters of the selective laser melting (SLM) process on the physicomechanical characteristics and microstructure of test samples made of unalloyed tungsten powder has been studied. It is shown that the SLM parameters have a significant effect on the formation of the microstructure of test samples. It has been experimentally proved that, at optimal parameters of the SLM process, a homogeneous equiaxed microstructure with an average grain size of about 10 μm is formed in the samples. It was found that the maximum value of the Vickers hardness of the studied SLM samples of unalloyed tungsten is 310 HV10; the maximum value of microhardness is 4.1 GPa. The maximum density value of the obtained samples is 19.1 g/cm³ (relative density is 99.2%). At the same time, it was found that a high crystallization rate and a large temperature gradient during the SLM process lead to the formation of microcracks and micropores in the structure of massive samples, which greatly complicates the technological task of obtaining high-density defect-free bulk products from unalloyed tungsten.</p>