The one single thing that I did that improve the accuracy of my cutting by leaps and bounds was to take thin strips of shelf gripper and glue it to the bottom of my rulers! Nothing moves, slips, or slides..it works better than you could ever imagine! Just be sure to glue them strategically so that you don't obscure all of the lines that you will need ..that's why I glued small strips instead of a larger piece. Worked so well that I put it on all of rulers!