I remixed the Talon box cutter to fit my several boxes of 3 notch blades. I have been using another holder to give away, but I liked this design. and when I printed, I found my 3 notch blades wouldn't fit. Well, it fit, but the blade extended out when retracted. Even the latest extended design. So I redesigned the blade holder side. It fits both 2 and 3 notch blades. Smooth and a grooved side. Thanks