This cut took a lot longer than I expected, over 6 hours.
But the result is a 8" x 12" landscape with Mt Hood, Mt St Helens and Mt Adams to proper scale in one piece.
Mt St Helens, I like how you can see the blown top / lava flow are
and Mt Adams with Mt St Helens in the distance
This was created from an STL file from https://touchterrain.geol.iastate.edu/ with 2.8 million vertices. The roughing was done with a downcut 1/4" inch bit (50ipm, 0.05" DOC and 1mm stock to leave), while the finishing pass was with a 1mm diameter tapered ballnose bit (50ipm feedrate, 16ipm plunge) and a small stepover.
The gcode file was 43 megabyte in size, which the new Carbide Motion had no trouble with, other than estimating 3 hours 40 minutes instead of > 6 hours.