I’ve just changed the blade in my rotary cutter and oh my, what a difference! Whenever I do this, I think to myself that I should have done it weeks ago. As I tell my students, we spend hundreds of dollars on fabric, but we balk at replacing rotary cutter blades and sewing machine needles. This doesn’t make any sense. Ergonomically and for ease of use, having a sharp blade is the way to go. With a new blade, fabric cuts are like cutting through butter. They are clean and can be made without applying much downward force on the rotary cutter.
When I’m teaching, I’m surprised how often I come across rotary cutters that are incorrectly assembled. I’ve had students say to me things like, “I’ve just put in a new blade, so I don’t know why it’s not working very well”. Make sure that you put it back together in the right order with the large black circle in the center on the top and the washer and nut on the back.