Thank you all for all the tips
But one last thing. I really want to print out completly rendered images.
But how do I make shure that the rendered image is in the right scale?
I tried to go to wiev - zoom - actuall size. But that is not the actuall size.
Also when I'm in my layout book and viewing an a3 layout, and I press "actuall size" it's still as small as a4. Do you understand what I mean?
My drawing here is in 1:50, but how do I get a right scaled image to my layout?