I've only ever been able to print bordered 12 x 12 on 12 x 12 paper. If I want a borderless 12 x 12 I now just print them on the 13 x 19 photo paper. Price wise the same anyway and super easy to do. I just add a bunch of other photos usually (plenty ...
I have an IP8720 as well and actually curious where you added the 12 x 12 as custom? I have both the old and new versions of Canon EasyPrint and I don't see custom as a Paper Size? I didn't uncheck borderless. Which software do you use for printing? ...
