motogal

First of all, you need to size your paper piecing pattern so that the design occupies a 9 x 9 space on a 9-1/2 by 9-1/2 square. That way, as you piece, the fabric will cover the design plus the seam allowance of 1/4-inch on each side of the block.

Also, if you make a copy of a copy, the resolution goes down, that is, the lines start to get a little fuzzy instead of being nice and crisp. But you can sew and cut in the center of the line and end up just fine. The trick is to get as good a first copy from the book as possible. Make that the "master." Then start making trial copies of that master, increasing the percent enlargement until the enlarged copy measures exactly 9 x 9 for the pattern, with a border 1/4-inch away, making a 9-/12 x 9-1/2 square.

You'll have to be careful to always use the same copy machine with the same percentage enlargement when making your copies of that master onto the paper foundation paper you want to use. Each machine is different. For example, I drew out a pattern very carefully with ruler and pencil on a piece of copy paper. When I made copies of it with my home copy machine, the pattern on the paper was 1/16-inch too small, it did not make a perfect copy, but reduced the copy to about 97% of the original.

Hope this helps.
Sabrina