It’s a neat idea, similar to how displacement maps affect the output without affecting the geometry of a 3D render.

Also, I like this image, as it makes me feel less bad about my own grizzly-looking heat block.

Interesting that this affects the gcode rather than the model itself. I wonder how this would compare to just sculpting surface details in something like blender

Velocity painting has been around for years but never integrated into a mainstream easy to use platform. I like the subtly of velocity painting a bit more, but regardless, I hope to see better slicer integration of some sort of surface painting feature soon.