Check a printable area of your printer.
Make a (grey) rectangle that is larger than the paper size. Print it,
you'll get a message that some cropping will occur, that's okay. Then take a
ruler and measure the dimensions of the rectangle printed on the paper or
the white borders around the printed rectangle.
Most desktop printers cannot image all the way to the edge of the page.
Thank you Olfar, tested and it still will not print to the edge. Must be because it's a desktop printer
Most printers just can't, even those costing millions of dollars. To print to the edge, in a professional environment, people print overside and cut off the edges.