Using resin 3D printing technology to manufacture technical products is a new trend that brings many benefits, especially when using open source or desktop devices due to cost advantages. In order to do this, it is necessary to determine the optimal technological parameter sets according to the intended use, equipment, and materials. In this study, the authors focused on understanding the influence of five technological parameters in the 3D resin printing process as well as the influence of their interaction on dimensional accuracy in each dimension, and all three dimensions L, W, H optimize technological parameters to improve the dimensional accuracy of test samples according to ASTM D5418/ASTM D7028 standards fabricated on desktop LCD devices using standard resin material. The experiment was designed according to the FCCCD method with 32 test samples. Analysis and optimization results on Minitab software and validation results show that the dimensional accuracy of the sample manufactured according to the optimal set of parameters found is close to the predicted value on the software. This demonstrates the process of selecting input technological parameters. The initial values of those parameters are appropriate, and the desktop LCD resin 3D printing device can be used to manufacture technical products for the production process.