Originally Posted by
Tartan
I always do my Snowball blocks by sewing the diagonal on a square placed on each corner. When you draw the diagonal line, think of that as your fold line not your sewing line. Sew just a smidgen outside that line so when you fold back the fabric your corner it goes to the edge.
This was one of the most useful tips that I've read. Just did many snowball blocks and by thinking of the line as the fold line, not the sew line, they all came out perfect