This thesis examines the suitability of 3D-printed photopolymer resin models for optical applications. The experimental work was carried out on models produced with a Mic-roSLA Micro 2 printer using MicroSLA UHR resin and different layer thicknesses. Light transmission was observed using an experimental setup with a 400 nm laser and a camera mounted on an optical microscope. The influence of layer thickness, surface smoothness, reflection, refraction, scattering, and material fluorescence was analysed. The results showed that a smaller layer thickness improves transparency and reduces the effect of sur-face ridges. A surface coating reduced optical losses in models with larger layer thicknes-ses, while its effect was less pronounced for the thinnest layers. Internal inhomogeneities, scattering, and strong fluorescence were observed in the material, reducing the intensity of the main beam. It was concluded that, despite improvements in surface quality, the in-vestigated resin is not suitable for more demanding optical applications.
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