Thanks for your message.
Oddly it seemed to work initially and now does not.
I Select Edge-to-Edge A3 in my cad programme, then when I go into properties, then custome properties, the dialogue box says the paper size is "Letter" . In the selection box I have lots of options, most of which I can't use. "edge-to-edge A3" is visible but with a yellow triangle with a ! in the middle. So I choose the "A3 297x720mm option and it won't let me print borderless! So my prints are cropped!
This was never a problem with my old Hp printer!
Any other suggestions?
Thanks again