As a European I use A4 paper size for my paper model design. A4 is 210 x 297mm, in the USA the standard size for paper is letter size. Amercians use ye olde inches for their measurements so letter size is defined as 8.5 x 11 inches.
I had an email from subscriber Maer who teaches in a middle school in San Francisco. She says:

"question: Do you have any tips for printing your templates out on US Letter? The tricky part seems to be the double-sided pages which do not align correctly front and back."

I don’t have much experience with letter size paper so I wondered if anyone out there could offer any advice? If you can please leave your
comments below – thanks!