Just wanted to upload these photos of the 12" marble tiles I tested on. The tiles are jet black marble and I resized the photo in photoshop and saved it at 333dpi and imported into coreldraw to process through the Trotec commander software. Initial setting was 333dpi and 100 power and speed 25 on Rayjet 30. This is the default setting for marble for power and speed. The issue is I ended up with a very noticeable banding. Searched the forum and found a post where someone was having a similar result and they reduced power to 50 and speed to 15 so that is what I tried for the next attempt and it has come out great. I will do some more testing to find the best combination where the banding disappears. You can see a difference in colour and clarity between the two settings in the middle photo. Yes I know I do not have any baby photos for the test but this model works for food and has some great detail with the whiskers.
Marble 3.jpgMarble 1.jpgMarble 2.jpg