Voltage drop cause print job to stop (2 replies)

Hello, I build a 3d printer. It works fine in normal use but when I turn on Air Conditioner (AC) in my house. There is voltage drop seen in house. Which as a result cause voltage drop on 3d printer for few seconds and if I am printing during that time the print job stops where it was when voltage dropped as if someone turn off and then on the printer and up ruining the printing object. I am using 12 volt power supply. Therefore I would like your feedback on it, what should I do.

Thank you