Thought I'd set the paper width to 15 inches and try the printographer since it allows you to enter a custom page width.
Cat picture from utility city printed at 3x magnification.

According to a webpage: "At first, the only Apple software that supported the wide carriage model was MacProject. Very few third-party applications initially supported it; most could print only as if there was 8.5-inch paper in the printer."

[Linked Image from]

I was thinking what would be cool is to be able to adjust the paper offset in real-time to do centering, that'd be fun to try.