I use my Olfa 45 but it took a bit of doing to get it to work. you have to be vary careful to hold the cutter straight. I learned that I could NOT use my either-hand Fiskars 45 rotary cutter because it bumped into the slot, which caused some ugly cuts in the teardrop part of one of the slots.
I love my shape-cut - I have the big one which will do 24" long pieces. Love it!