Though 3D printers have become popular for manufacturing prototypes in a number of fields, they are rarely used to make injectors due to the relatively large tolerances and surface roughnesses. The flow characteristics of a swirl injector are known to depend mainly on its geometric shape and the injection conditions. In the present research, the possibility of whether or not a 3D printing technique can be applied to manufacture a swirl injector has been examined. Using different printing directions and methods, three close-type swirl injectors were created on a 3D printer using a light polymerized process. For each injector, cold flow tests were conducted to measure the mass flow rates, discharge coefficients, and spray angles, while changing the injection pressures. The data obtained from the printed injectors have been compared with those from a metal injector manufactured by mechanical machining. The results show that the quality of the printed injector depended on both the printing direction and method. If one chooses a suitable method for printing a close-type swirl injector, the injector could have a discharge coefficient within a 7.5% error and a spray angle within a 12% error.