Personally, I find OLFA to be at a whole other lever as far as sharpness goes. It's probably also due to the steel they use, but I have never had anything remotely as sharp as these cutters. They are truly surprising, borderline dangerous...
And regarding the diameter of the blade, I've been thinking about it since the orignal post and I would intuitively say that a larger disk might actually be even more effective; My thinking is that the larger the diameter of the blade, the shallower the angle between the blade and the cutting surface. This gives the material less of an opportunity to "slip" out... But I could be wrong and it might be the other way around If anyone has different size rotary cutters I would love to get your feedback.
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