epson 3880 will not print a3 from cs6

i am on an old intel mac pro with lion 10.7.5 using photoshop cs6 13.05 64 bit

i can not print a3 i get a cropped a4 shape in one corner of the a3 page

the file will print fine in preview but not through photoshop.

print dialogue says eveything should be ok displays in the window as it should print .

but doest come out

epson 3880