Used VCarve and a cheapo 4"x4" bathroom tile. Once I find an interesting set of images I’ll probably make a set of coasters. 15min start to finish, no headaches, perfect for a sunday lazy CNC session.
What kind of tile is that? I had read online that porcelain was not good for drag bit engraving, and that granite was the way to go. But I can’t find 4"x4" granite.
Granite would definitely be much better, but try as I might I could not find any source locally where I live in the right form factor (i.e. small dimensions, and not too thick), so I just grabbed a box of these (I am not even sure whether that is porcelain, will check) to see how it went.
For beautiful granite examples check out @MadHatter’s work (e.g. in this thread)