In this case because I had over sized canvas it was a 24" wide (roll) Page size 24 x 13. Printed horizontally.
And the image width when printed was clipped a 1/4" from 17" to 16 3/4"
I just did a print test ,changed cell size to 11 x17 1/4" and then got a 11 x 17 print. Hmmm?