Ok I got my GF about 2 hours ago and this is the first thing I’ve done. I am wondering why the heck the brown spots happened, its not like that on the file. The file uploaded was an SVG that was all black. I did full speed and full power with 340 lines per inch. Its not charing and it defiantly doesn’t wipe off. I don’t know if the power was too high but its odd that it only did it at certain places on the image.The spots where it is white, the lines are super crisp but the brown spots the lines look fuzzy. Its kind of hard to tell that in the image. I uploaded a screenshot of what the files looks like for reference!
I was going to say the same thing as @lairdknox. Any dirt or oils on the surface could definitely affect the engraving.
Y’know, you are in a potentially very useful position for this community. It would, I’m sure, be tremendously helpful to have somebody run some sample engravings at various speed and power settings on a bunch of MacBooks and iPhones.
Okay so I took another try after cleaning the laptop with alcohol and using a different file. I also turned down the power to 99. I’m also wondering since this is a MacBook Air and slightly thinner on one side then the other if that made a difference the first time. This bow was done on the thinner side of the computer.