Finally got around to posting my experiments with Slate. This first batch includes the test pattern I used. I found the best results were midrange power with 2667mm/min and my 30W Diode laser. The highest power settings weren’t any better and seemed to have a brown tinge to the exposed area. I used 0.1mm interval on the fill.
Here are the same tiles with sealer applied.
Overall I’d rate this process as very easy and reliable. Another +1 for Rich!