Charring pattern difference at start vs end of engrave

[AhnoldZ]

It’s come up just a bit in the past. Here’s one reference I found:

3D engrave -- still needs some work but wow

I think wood might be a better medium. Downloaded a Green Man from thingiverse and converted to depth map: [greenmanpic] You can see the goop that accumulates downwind. Used two slower passes for depth, then one fast pass to clean off the char. Then a cut that was just a bitmap trace outline, outset by an approximation of kerf.