Here I made a 3D layered Firefighter plaque for one of our red line flags. (The white inside the lettering is just wet coating that didn't completely dry yet when I took the pictures). I used 3 different settings: 
1) To cut the back plate that I painted black.. 3.5mm/sec @100%    
2) For the light engraving 50mm/sec @100%   
3)For the deep engraving on the words   20mm/sec @100% 

I used E6000 to glue the wood together.

Let me know what you think!