Hi, I just found out how to make a jpg file in to a vektor file with closed clean and single "no bul****" vektor lines suitable for cnc machining / engraving or venyl cuting or what ever.
Import jpg to illustrator.
Mark the jpg, then go: Object > Image Trace > Make, then tweak settings as desired in image trace window/toolbar > Object > Image Trace > Expand, > In the Pathfinder toolbar hit Merge one time (or two times) then also in the Pathfinder toolbar hit the Outline button.
It should work to export it as pdf / dxf, or in my case just open it in Rhino3D as an .ai file.
Mabe you knew mage you didn’t. I didn’t. So I had to share it some ware
Bles you all.