A method of using an injection molding machine, the method comprising: first, injection molding using a first injection molding machine, a first mold, and a native controller to injection mold production versions of a plastic object according to an original mold cycle for the first mold, the first injection molding machine including an injection unit, a nozzle in fluid communication with the injection unit, and the first mold, which is in fluid communication with the nozzle, wherein the native controller is programmed with at least a portion of the original mold cycle, wherein the original mold cycle has a maximum original injection pressure (400-m), and wherein the native controller at least partially controls injection pressures of the machine according to the original mold cycle; and characterized in that the method further comprises: second, injection molding using a second injection molding machine, a second mold, and a retrofit controller to injection mold production versions of the plastic object according to a retrofit mold cycle for the second mold, the second injection molding machine including an injection unit, a nozzle in fluid communication with the injection unit, and the second mold, which is in fluid communication with the nozzle, wherein the retrofit controller is programmed with at least a portion of the retrofit mold cycle, wherein the retrofit mold cycle has a maximum retrofit injection pressure (800-m; 900-m; 1000-m; 1100-m), and wherein the retrofit controller at least partially controls injection pressures of the machine according to the retrofit mold cycle; wherein the maximum retrofit injection pressure is 10-60% less than the maximum original injection pressure. first, injection molding using a first injection molding machine, a first mold, and a native controller to injection mold production versions of a plastic object according to an original mold cycle for the first mold, the first injection molding machine including an injection unit, a nozzle in fluid communication with the injection unit, and the first mold, which is in fluid communication with the nozzle, wherein the native controller is programmed with at least a portion of the original mold cycle, wherein the original mold cycle has a maximum original injection pressure (400-m), and wherein the native controller at least partially controls injection pressures of the machine according to the original mold cycle; and characterized in that the method further comprises: second, injection molding using a second injection molding machine, a second mold, and a retrofit controller to injection mold production versions of the plastic object according to a retrofit mold cycle for the second mold, the second injection molding machine including an injection unit, a nozzle in fluid communication with the injection unit, and the second mold, which is in fluid communication with the nozzle, wherein the retrofit controller is programmed with at least a portion of the retrofit mold cycle, wherein the retrofit mold cycle has a maximum retrofit injection pressure (800-m; 900-m; 1000-m; 1100-m), and wherein the retrofit controller at least partially controls injection pressures of the machine according to the retrofit mold cycle; wherein the maximum retrofit injection pressure is 10-60% less than the maximum original injection pressure. second, injection molding using a second injection molding machine, a second mold, and a retrofit controller to injection mold production versions of the plastic object according to a retrofit mold cycle for the second mold, the second injection molding machine including an injection unit, a nozzle in fluid communication with the injection unit, and the second mold, which is in fluid communication with the nozzle, wherein the retrofit controller is programmed with at least a portion of the retrofit mold cycle, wherein the retrofit mold cycle has a maximum retrofit injection pressure (800-m; 900-m; 1000-m; 1100-m), and wherein the retrofit controller at least partially controls injection pressures of the machine according to the retrofit mold cycle; wherein the maximum retrofit injection pressure is 10-60% less than the maximum original injection pressure.