Misalignment with printing - image too close to edge of paper

Hello everyone, I'm having a minor difficulty with printing out the strips; - the print is too far to the edge of the paper resulting in one of the guiding edges not printing. So, when I attempt to cut the strips with scissors, there is no way of being certain that the width of the cut out strips is accurate. The problem then becomes apparent when I feed the strips into the 30 note music box as the some of the notes played are wrong. This is due to a misalignment. Anyone got a solution as to how to centre the image on the paper before printing?