If you are printing a PP pattern from the internet, I just would print it on copy paper. Then I scan it and enlarge it as a photo, then you can print it out. Remember that with PP, if you enlarge it, your 1/4" seams will be wider than normal. This is when Electric Quilt comes in handy. Once you have the PP design drawn in the program, you can change the size of the pattern but the seam allowances will stay the same.