Additive manufacturing (AM) represents a set of processes that enable the creation of objects based on a computer 3D model by applying particles in thin layers, layer by layer. The additive manufacturing technologies used in this work are fused filament fabrication (FFF), stereolithography (SLA), and digital light processing (DLP). The first goal of this work was to use FFF, SLA, and DLP technologies on 3D printers to create test plates from transparent materials to determine the most suitable material for 3D printing of reactors in which photochemical reactions would be conducted for 2 hours. The computer-aided design (CAD) software Fusion 360 was used to create the test plate models, followed by 3D printing of the same. Using FFF technology, models of plates were made from polypropylene (PP) and polyethylene terephthalate glycol (PETG), while SLA technology produced models from polyacrylate, and DLP technology produced models from a mixture of polyacrylate and epoxy. Additionally, the materials used in SLA and DLP additive manufacturing technologies undergo post-processing, or a subsequent curing process lasting 5 and 15 minutes. Properties of the polymers used to create the plates were tested using a swelling test in the acetonitrile solvent. The results indicate that the degree of swelling of the sample is greater if the post-curing time is shorter. After conducting the test and considering the degree of swelling, it was concluded that the High Temp resin is suitable for printing reactors because it has the lowest swelling degree after 4 hours, amounting to 3.2 %. Additionally, the aim of this work was to conduct photochemical reactions in the Luzchem CCP-ICH2 reactor for a duration of 2 hours at a wavelength of 313 nm. For conducting photochemical reactions, reactors with static mixers and reactors without static mixers were used. The CAD program Fusion 360 was used to create the reactors, followed by 3D printing of the same. The reactors were then subjected to post-processing for 5 minutes. The photochemical reactions were conducted to see if there is a difference in the obtained products when using reactors with static mixers versus without static mixers, and to see if better conversion is achieved compared to batch photochemical synthesis. Thin-layer chromatography and ultra-high-performance liquid chromatography were used to determine the presence of photoproducts after the reactions. The results obtained from conducting photochemical reactions indicate that the highest reaction pseudo-yield of the reaction was achieved after 2 hours of conducting it ina reactor with partitions, specifically for the sample 3-preg-2h(I2) and amounts to 21,15 %, while the lowest pseudo-yield was achieved after 2 hours of conducting the reaction in an empty reactor, specifically for the sample 3-praz-2h(I2) and amounts to only 6.69 %. Additionally, conducting photochemical reactions for samples 3-praz-1h(I2), 3-praz-2h(I2), 3-stup-1h(I2) and 3-stup-2h(I2), the target product 4 is produced in relatively low yields, whereas for samples 3-senz-e-1h and 3-senz-e-2h somewhat more by-products are formed in relation to the main product. These results indicate that mixing is probably most intense in the reactor with partitions. Furthermore, highter yields in the case of a reduced volume reactor indicate that a thiner layer through which light passes during the reaction has a significant impact of the yield, but aldso that the material through which light passes, which is a polymer in this reactor, cas also have a significant impact of the yield.