Additive manufacturing, also known as 3D printing, is a technology that enables the creation of three-dimensional objects layer by layer. The manufacturing process begins with designing a model in CAD (Computer Aided Design) software, which is then saved in STL format and transferred to the additive manufacturing machine. After setting the machine parameters, the prototype production begins, followed by post-processing if necessary. The aim of this study was to determine the influence of manufacturing and post-processing parameters on the properties of epoxy resin used for 3D printing with digital light processing (DLP). The dependence of mechanical, thermal, and chemical properties on the printing angle and curing time in a 405 nm chamber was examined. The resin used for 3D printing is epoxy-based resin (AnyCubic 3D Printing UV Sensitive Resin). The test results showed that the printing angle and duration of post-curing have an impact on the mechanical and chemical properties of the 3D printed test samples. Test samples printed at a 90° angle exhibit the highest strength and toughness, but the lowest elastic modulus. As the printing angle decreases, the strength and toughness decrease as well, so test samples printed at a 0° angle generally have the lowest strength and toughness, but the highest elastic modulus. Additionally, samples that were not post-processed or had shorter curing times show lower strength, but higher elongation at break and toughness compared to samples printed at the same angle but with longer post-curing. By examining the chemical properties through swelling in water, acetone, and methanol, it can be concluded that all samples swell to a certain extent in all solvents. The highest degree of swelling is achieved by samples swollen in organic solvents such as acetone and methanol, while water, as an inorganic solvent, penetrates the samples to the least extent. Additionally, a trend of decreasing solvent absorption was observed with an increase in the exposure time of the samples to radiation in the 405 nm chamber. During the examination of thermal properties, no significant influence of manufacturing and post-processing parameters on the thermal properties of the samples was observed. FTIR analysis confirmed the presence of characteristic functional groups and vibrations in the 3D printed test tubes and in the liquid resin sample.