There are a few single line fonts for laser cutting and cricut etc over at this blog
https://www.k40lasercutter.com/product-category/single-line-fonts/
Type: Posts; User: sammie928s
There are a few single line fonts for laser cutting and cricut etc over at this blog
https://www.k40lasercutter.com/product-category/single-line-fonts/
Sounds like it may be an issue with your mirrors not being clean enough to form a single beam? Please check K40 settings for different materials as well to see if your power and speed settings are...