Dennis, I have seperate blades for both of my plotters. One plotter has a 45 degree blade for regular vinyl and another 60 degree blade for thicker materials. Another plotter has 3 seperate blades, #1 for regular vinyl, #2 for laminated vinyl or thicker materials and #3 for cutting completely through materials. All the blades are the same type and the only difference is how far each tip is extended. I like having seperate blades so that you aren't constantly adjusting the tip extension and you are minimizing the wear on the blades across the spectrum of materials. It is something I'm just used to and prefer to work this way. I also adjust the pressure, speed, etc. in the settings when changing materials along with switching blade holders. This way you always have a spare on hand also in case one fails. I've made a chart that specifies the blade # and the setting for different materials so it is a very simple matter to get it right without any thought or delay when constantly switching materials.