I am a new member of this forum and I would like to express my gratitude for all the help and support provided by the people here.
Let's cut to the chase, I' m using Altium Designer 14.3 and I can't find a solution for a problem that confuses me for days. The problem is that when I try to print my PCB the printing size is a bit smaller than the actual one. The page scale is 1:1. I've tried to print it from gerber files, from print preview and from Fabrication outputs -> final but every time I have the same issue with every PCB I'm trying to print.
The same problem has been noticed in some older threads like this one, but unfortunately there has not been a final answer to solve it.
It seems as being more a problem on settings of the specific printer driver you're using than on Altium itself. At least on the Altium version I've used, the output size on printing matched to the real scale.
Thanks for the answer andre, it seems that the mistake was that I first printed it as a PDF and then with a I printer. I tried to print it immediately before converting it to PDF and the size was the real one this time.