The Default Target Attribute is .inner targeting that div in that page. I also have a logo added in the Print Page Top HTML…that may be why you think it is printing the entire page.
However I found a work-around for the Safari issue. I don’t know if it is a bug in Print-O-Matic or not, but if I turn off the Close After Print (was turned on), then the page pop-up and print dialog box comes up, allowing you to print in Safari.
Let me know if you see that on your end as well.