I used the xtool f1 to engrave an image on the aluminum block.
The aluminum block was 26 mm thick. Quentin kindly brought me to the water jet where we cut a rectangle around my engraving.
I attempted both engravement of the full image and of the silhuoette. The detail looked more interesting on the full image, but since I added several passes on the actual run (and did it on a side I had sanded) I lost a lot on contrast.