Why is it when I print a photo on a printer ( regardless of the program, or seemingly the printer ) will it NEVER be centered


I mean it's not much to ask.
I do the artwork, set it up correctly, check it in preview where it appears as totally centered. By this I mean, the white border top bottom left and right are all equal.
But lo and behold, everytime I print - the top border is a little less then the bottom ( this I can just about accept, as that is the correct way to weigh the top/ bottom borders when composing a picture )
BUT THE LEFT HAND BOARDER IS ABOUT 4 TO 5 TIMES THE SIZE OF THE RIGHT. TOTALLY UNACCEPTABLE.
This then means if I want a centered image in my portfolio, I then have to trim the left side of the paper which then means it's no longer A4. It's as if the printer has fed in about 3/4 of an inch of paper before printing, which no one has accounted for.
Any ideas guys//
cheers
I mean it's not much to ask.
I do the artwork, set it up correctly, check it in preview where it appears as totally centered. By this I mean, the white border top bottom left and right are all equal.
But lo and behold, everytime I print - the top border is a little less then the bottom ( this I can just about accept, as that is the correct way to weigh the top/ bottom borders when composing a picture )
BUT THE LEFT HAND BOARDER IS ABOUT 4 TO 5 TIMES THE SIZE OF THE RIGHT. TOTALLY UNACCEPTABLE.
This then means if I want a centered image in my portfolio, I then have to trim the left side of the paper which then means it's no longer A4. It's as if the printer has fed in about 3/4 of an inch of paper before printing, which no one has accounted for.
Any ideas guys//
cheers