Photoshop won't print actual size

Hi guys, i made a simple layout which needed to have certain measurement. 

i used guides in my file to get the exact dimensions (even put the actual ppi of my monitor) but when i go to print directly from photoshop it says that the file is too big and it will be scaled down.

is it just my printer that have a strange print size for A4 or do i need to change something?