Originally Posted by
cindi
Have you checked the measurements of your ruler and your mat? Yes, they can be different! I have one ruler I had to get rid of because the lines were actually off by 1/8”. Use a professional metal tape measurer to check the lines on both. You may be surprised, too...
Yes, that was what I was about to mention. The measurements between rulers can be different between manufacturers too. The longer the measurement, the worse the problem if using different rulers.
Also, some of the lines on rulers are thicker than others making it hard to be consistent. I find that the Quilters Select rulers have nice thin lines that are easier to see and a grippy back that makes cutting fabric easier. I'm treating myself to one new one a year when they are on sale.