Originally Posted by Sewnoma

I have the June Tailor rulers and what I do to avoid shifting, is after I make the first cut (usually to trim off excess), I pull that first cut piece out from under the ruler and let the plastic strip drop down and butt up against the rest of the uncut fabric. It sort of makes a lip that holds it all straight. As long as my fabric was folded properly in the first place, I get extremely accurate cuts, pretty quickly.

I have the big ruler that has only 2-1/2" cutting lines and I love that thing. I also have the smaller one with the 1/2" lines. I use them both a LOT.