I just bought and built a Creality Ender 3 V2. The last step of the setup is to flip this little yellow switch on the power supply to be either 115 V or 230 V. From my other research, I think that I have to flip the switch to 115 V because I live in the US. Since US standard outlets give 120 V of electricity and not 115 V, I am confused. Why is 115 V "correct" if the voltage I will supply is actually 120 V? Will this extra 5 volts burn out the printer?