In this study, nylon was used in a common 3D printer as the base material to print thin-walled specimens, and the printed objects were placed on a PJ-A3000 optical measuring projector to measure the deformation value. We used printing speed, layer thickness, and specimen size as parameters to explore the relationships between the printing parameters and the deformation value during the printing process. The printing speed ranged from 30 to 80 mm/s, and we used 10 mm/s as an interval to determine its effect on the deformation value when the layer thickness and specimen size were set at 0.2 mm and 70 mm × 100 mm × 0.2 mm, respectively. When the printing speed and specimen size were set at 80 mm/s and 70 mm × 100 mm × 0.2 mm, respectively, three different layer thicknesses, namely, 0.15, 0.2, and 0.5 mm, were used as the printing parameters to explore their effects on the deformation values of nylon thin-walled specimens 3D-printed at the same speed of 80 mm/s and the same layer thickness of 0.2 mm. Finally, the length and height of the specimens were 70 mm × 100 mm and 70 mm × 150 mm, respectively, and the thicknesses of the designed specimens were 0.2, 0.4, 0.6, and 0.8 mm to determine the deformation values of the 3D-printed nylon thin-walled specimens.