I have used this knife to cut 0.050mm thick aluminum it cuts like butter. Using a ruler against the muzzle works well for cutting smooth, straight lines. It takes a steady hand to cut a smooth and precise curve, but it's not difficult to achieve. I should mention that die cutting machines are not circular saws where you can see the cutting process and control accordingly. With the die cut you'll see a 1/4 inch cut after he makes the cut and it's really maneuverable so if you're not careful…