How can monitor/spy any content that comes out of my printer? -

In our house, we have 3 computers and 1 printer. Is there a way I can know or spy what is coming out of my printer ?

If there s a central computer that prints all things people want to print from their computers, you could set it up so it holds copies of everything printed. But I m sure glad you re not living in my house: if I d find you spying on me I d kick you to the curb.