Being in the copier repair business for a long long time here is a real easy way to make sure you have a 100% copy. take a fine graded scale/ruler, the longer the better; and lay it on the copier glass lengthwise make a copy and then move it to front to back setting it to far left, compare it to your scale. most copiers are not set to perfect 100%. make changes to the increase and decrease buttons on the machine and see what happens. I have set up many machines to make perfect 100% size copies so it can be done. Most places can't do this right away because it will take a tech to do this.