I still haven’t purchased a ribbon cutter but plan to have one soon. That would be the easiest way, but for now I use a pizza cutter and I can usually get my ribbons/stripes pretty straight. Better than with a knife. But, yes, if I am making them all the same size and they need to be pretty exact, I use a ruler.
I plan to make my own ribbon cutter from a long bolt, nuts, pizza cutter blades and pvc. You can adjust it to any width you want this way and cut like 8 ribbons at the same time. I’ll see if I can’t find the tutorial for you.
