If you are printing on the 12 x 2.5" pre-cut icing sheet, there is not a clear solution to print to the very edge of the right-hand side topper, since the margin is too tight on the edge for most printers (see example- photo credit Daniela Miraglia).
One solution, if you are on the Grow plan or higher, is to design a template that has a slightly smaller circle across each topper, meaning that there will be a little white space around the inside of the circle, but also means that there will be no vertical line.
If you have any more questions about this, drop us a note at support@topperoo.com