Kathy, LOL! I really needed that, I'm having a crappy day, and feel like a big grouch.
I mostly use one ruler, its a 4x18. I have a smaller one that I use for little cuts sometimes. And I have a bigger one that I never use.
I use a 45mm Ofla, with a brand new blade in it.
Also, I am squaring it up at the beginning.
Maybe I'm not being as "careful" as I think?