So I used my knife blade for the first time yesterday. It asked me to calibrate it first. Which I did. Fast and painless. I cut out some flowers from real leather and also engraved on them. It said it was doing 4 passes. I checked after two and it had cut thru like butter. Awesome. Love it. Thanks cricut for adding another craft to my endless many that I do. Planning on cutting leather for flowers for keychains and purses.