why when setting up lines for laser cutting 0.001 I get like a weird bleed outside the line

@yaicecream well, when setting a line's stroke to so thin as 0.001 pt in Adobe Illustrator for laser cutting, the "bleed" or distortion you're seeing is a rendering glitch, not an actual issue with the vector path itself.  It's difficult for Illustrator's GPU preview to display it accurately on your screen. To get rid of the visual distortion while you work, you can switch the view mode in Illustrator. Use the keyboard shortcut Cmd  E on a Mac to quickly toggle between GPU and CPU previews. Or View - Preview on CPU. The switch the rendering from your graphics card (GPU) to your computer's processor (CPU), which often resolves the display bug for very thin lines.