The paper presents experimental process of manufacturing individualized prosthetic sockets out of thermoplastic material, using an additive manufacturing technology of Fused Deposition Modelling. The patient is an adult male with an amputated forearm. His stump was 3D scanned using a low-cost 3D scanner in a semi-automated manner. Then, the anthropometric data was used for creation of a model of a prosthetic socket, which was then manufactured. Three different 3D printers were used, with three different materials (ABS, nylon and PC) and three different sets of process parameters. The paper contains descriptions of the process, its results and opinions by the patient, leading to selection of an optimal process course variant.