I have used a lot of things to help solve this problem, but part of my problem is that I'm short and have shorter arms than taller gals. So as I cut the fabric, the farther away from my body I get, my hands angle away from my body and I lose downward pressure that I get when my hands are right next to me. Especially when I am using longer rulers or I'm cutting on a higher cutting table. So sometimes the fabric will slip some at the end of the cut even with using different gizmos to help. Stopping and moving my hand along the ruler, leaning forward to extend my reach...without bumping the fabric/ruler, avoid using rulers longer than 12 inches, and cutting half way up from my body, then half way down toward my body helps me to keep the fabric from slipping. When I use a dull rotary blade, it tend to push the fabric around instead of cutting it too.