In recent years, additive production technology has spread to almost all manufacturing areas. In most cases, a fiber is used as an input material in the 3D printing process, the required properties of which are mainly its strength and durability. With the ongoing development of the 3D printing techniques, the need to develop fibers that do not pose a burden to the environment comes to the fore. This paper points out the possibilities of producing fibers intended for additive production. The paper describes the fiber production on FilaFab PRO EX350 device used for producing fibers for the 3D printing technology. The aim of the paper is to describe the production of fibers and to compare commonly available fibers with the experimentally made ones. To run the tests, a clear fiber and a composite fiber with carbon powder filler were produced. The mechanical properties achieved by these experimentally produced fibers were compared in tensile tests with commonly available fibers purchased from sellers of 3D printing materials.