Originally Posted by JustAbitCrazy

Buy a Quilter's Slidelock ruler and Sally Collins book on Precision Machine Piecing. In it she recommends keeping the thin black line on the Omnigrid/Omnigrip rulers ontop of the fabric prior to cutting, because then it gives you the space needed for the thread and turning thickness, and you don't need to try to sew a scant quarter inch seam. She also recommends starching, which has already been mentioned.