I can never get the lines on cross hatching - either square or diamond- to end up correct and even when I use the guide on the walking foot or pressure foot. So I discovered to mark or dot all around the area at 1" intervals or whatever measurement you want and then with long ruler to connect the dots. This gives me more even lines and the hatching ends up as squares or diamonds. I rip too much out when I don't do this. A 1" interval will produce about a 3/4" square. 2" will give little over 1.5" square etc.