Something seems messed up with the print preview in Rhino 8. Below is a screenshot with a little square and diagonals in the very corner of the A3 layout. In the preview this square is not in the corner. The spacing left and right is too large and should actually in this case be just 10 mm.
The printed PDF has the correct size and looks correct.
Rhino 7 preview also looks correct.
I created a layout manually in a new file and the first time I ran the print command, the preview looked correct but the second time the spacing was too large again.
I have PDF24 installed, maybe this is the problem?
print_preview_size_a3.3dm (61.7 KB)