According to the below linked article the pro9500 mark II can print a maximum custom paper size of 42.0 x 67.6 cm.
Your driver info page for that printer lists the maximum print size as 35.56 x 67.59cm.
Is it possible to access the wider dimension with an upgraded version of TurboPrint?
link to review:
https://www.photoreview.com.au/reviews/printers/canon-pixma-pro9500-mark-ii/
Max paper size Pixma pro9500 mark II
Re: Max paper size Pixma pro9500 mark II
Hello, I just checked and the maximum print size is actually 14"x26,21" / 355,6x676mm according to the Canon Windows driver, so the sizes in TurboPrint should be correct. I think paper which is 42cm wide will not fit into the printer.