Shrinkage is a significant factor to consider when fabricating casting patterns using 3D printing technology. This article presents a study investigating the influence of five key process parameters on the shape accuracy of investment casting (IC) models. These parameters are: layer thickness, exposure time, infill density, shell thickness, and final layer exposure. The models were produced using LCD (Liquid Crystal Display) 3D printing technology with Anycubic Dental Castable Resin material. The experimental plan was designed following the Response Surface Methodology (RSM) and the collected data was analyzed using Minitab software. The results demonstrated that the technological parameters, as well as their interactions, significantly affect the desired outcome. The optimized parameter set was determined to be: layer thickness of 0.0662 mm, exposure time of 20s, infill density of 20%, shell thickness of 1.7121 mm, and final layer exposure of 80s. This successful research contributes to enhancing the quality of 3D Resin LCD printed products used in prototyping for the IC process. This advancement aims to support the manufacturing industry in developing countries, including Vietnam, by providing them with applicable solutions.