Originally Posted by Prism99
A much cheaper thing to try out first (for straight strips) would be a June Tailor Shape Cut mat. This is a flexible mat with cut-outs to hold your rotary cutter in place as you roll. If your problem is with how you are holding the rotary cutter (the blade should not be tilted as you roll), it will show up when you use this mat.
I agree. The Shape Cut mat could be your answer. The slots hold your blade in place and make your cuts straight. I really love mine and use it everytime I cut fabrics for a quilt.