The more significant development of additive manufacturing technology in the last decade and its application are important factors both in catalysis, which represents one of the carriers of the chemical industry, and in the new industrial revolution, which is also called Industry 4.0. The development of additive manufacturing was possible thanks to the digital revolution, whose methods are based on a quick and efficient transition between the digital model and its physical realization, in contrast to previous, traditional methods that are based on predetermined molds and are limited to the production of identical products, while digital methods provide much greater flexibility. Additive manufacturing technology finds application in chemical engineering and in the field of catalytic reaction engineering in the form of process intensification and for the development of structured catalysts. One of the technologies of additive manufacturing, which is used for the creation and development of complex monolithic catalysts, is the technology of fused filament fabrication (FFF).In the theoretical part of this work, an insight into the application of process intensification in chemical engineering is given and additive technology and its application are described in more detail, as well as the application of fused filament fabrication technology in catalysis for the production of complex monolithic catalysts/reactors. The FFF technique has numerous advantages, most of which are manifested in the possibility of manufacturing products that cannot be obtained using traditional techniques. Research has shown that the FFF technique has certain disadvantages, such as staircase effect, the need for subsequent processing including removal of the supporting structure, high surface roughness, etc. Further development of composite materials/filaments that contain thermoplastic materials such as polyethylene, polystyrene, aliphatic polyamides, etc., will probably lead to the compensation of some of the existing problems and enable better efficiency of the application of additive manufacturing technology in the field of catalytic reaction engineering.