I use re-cycled copier paper all the time for pp'ing, use a very small stitch and make sure I crease the paper when I fold it back to trim the seam allowance - even if the seam allowance is okay and no trimming is needed, I fold the paper back and run my finger on the line, then un-fold it and start with the next step. Even with tiny intricate pieces I never have a problem with getting the paper off, a pin stuck in a point or corner will start the paper to tear if it doesn't pop out with a gentle twist and my stitches are intact.