 This study investigated the effect of annealing time, temperature, and layer height on the tensile strength and dimensional change of three 3D printing materials, PLA, PTG, and carbon fiber reinforced PTG. Samples with varying layer heights, 0.1 millimeters, 0.2 millimeters, and 0.3 millimeters, were annealed at temperatures ranging from 60 degrees celsius to 100 degrees celsius for 30 minutes, 60 minutes, or 90 minutes. Tensile tests were performed, and regression models were developed to analyze the effects of these parameters on tensile strength. The models exhibited high accuracy, with a maximum deviation of only 5% from measured validation values. Layer height was found to have a greater effect on tensile strength than annealing time and temperature. Optimal combinations of parameters were identified for each material, with PLA performing best at 0.1 mm slash 60 minutes slash 90 degrees c, PTG, and PEKF achieving optimal tensile strength at 0.1 mm slash 90 minutes slash 60 degrees c, and PEKF demonstrating. This article was authored by Elena Arstoykovich, Riko Turutija, Nikola Vikovic, and others. We are article.tv, links in the description below.