I thought I was going to be really smart and stay-stitch my string-pieced squares 1/8 inch from the edge.
Then I sewed the units together with a 1/4 inch seam.
Not one of my brightest ideas. It was a major hassle to pick those bits of paper off the edges!
I picked the pieces of paper off after sewing the units together.
The fold back method pf piecing is great!