The 60mm is great for cutting batting or fleece.

I have made a couple rag quilts that required the 4.5" squares of batting. I use a 60mm cutter all the time and like it better than the 45mm. When I made my rag quilt, I used left ofer pieces of batting which seemed easier to cut that from a large piece. Plus I was able to make my pile smaller of left over batts from quilts. I also found that if I cut 50 or so at a time and then took a break that it did not seem like such a big project. Good luck and I'm sure your grandkids will love them.

Thanks to Pocoellie for mentioning the June Tailor Shape Cut, I did a search on it to see what it was. Wow I was shocked to see I already had one of them, but had no idea how it was really used. I also did not know about sewing and cutting the triangles like that either. I will have to say, when I learn to really do all this..it will be 100% because of all you wonderful people on this board.
You know they have Computers for Dummies books...wonder if they have Quilters for Dummies?? lol

I love my 60mm. If you have some help, what if you were to use two rulers to push the batting down, leaving a very small space between them, and then make the cuts?

I love my 60 mm cutter, in fact that is the one I use the most. I don't know if you could use the Accucut for this project of yours or not. Maybe if your LFS has one they would rent or let you use it. Just a thought, but maybe they are only meant for fabric.

If you cut batting with your rotary cutter, fibers of the batting get caught up in the cutting mat and are almost impossible to remove

I use my 45mm cutters for almost everything and they cut my batting well. I've never had a 60mm cutter though, and it may work better on multiple layers. If you don't like cutting batting maybe you can find the pre-cuts from Ebay as was suggested in an earlier post? Or trade cutting chores with a fellow quilter?

definitely use a 60mm rotary cutter for batting. It is made to cut through more layers than the 45mm.

I would get a different pattern rather than cut all that batting. What is it, a puff quilt? Jan

They do and there is even a new addition. It is by Cheryl Fall