How to Sharpen Your Rotary Cutter Blade: fold a piece of foil a few times; slice away with blunt/dull rotary cutter, pausing a few times to test it out on fabric scraps till it starts slicing your fabric. end up with an almost new rotary cutter!
Might work for my paper trimmer blades? How to Make Your Rotary Cutter Last Longer Sharpen rotary cutter blade by folding tin foil several times and cutting it with Cutter. Test on fabric scraps until it is sharp.
all you need to know about rotary cutters--I need one and I know nothing! Looks like she recommends a for the best diversity. Also good info about cutting mat sizing and cutting ruler features snd sizing.