Cut my first mylar stencil today. Used 4 mil mylar from Amazon (https://amzn.to/36nTJVZ).
Focus Height: 0.01
Used a piece of cardboard under the mylar and magnets to hold it to the bed so it didn’t blow around. It cut the mylar and only scored the cardboard (which didn’t matter because it was just used as protection).
No scorching or melting. Nice crisp cuts.