i got these orange stretchy strips @ the sewing expo a few years ago, i know they have them @ clotide.com.... it works kind of like those holiday window clings
you pull the length a little bit, then position it on the back side of the ruler @ whatever width your strips need to me....
then you slide the ruler over the fabric, the orange thing stops @ the cut edge and every strip comes out the same
when you're done, you peel the orange stretchy thing off your ruler and put it away for the next time
i've been using the same pkg of 3-4 for 4 years come april and they still work like they did when i bought them....
unfortunately, the pkg they came in has been gone forever, so i can't tell you the name of the product. but i'm sure someone else on here has tried it...