I used a 30 degree engraver for the wax and silver engraving. I use a 4 axis jewelry mill. It was satisfactory at best. Switching to a 20 degree engraving cutter is much better. The letters are very clear, even the smallest ones are very clean! I can't say anything about the edge retention, but now, after about 30 minutes of engraving, the sharpness is better than ever.