I've been assuming that detail size refers to the minimum displacement along the normal of the surface that is needed for a detail to be seen. However, I just saw this (awesome) ring: http://shpws.me/oubJ Clearly, those craters aren't 1mm deep/high, but they show up great. I figure this means that I can be a lot less conservative in my designs, but I'm not exactly sure now what the limitations are. So, I'm wondering, what exactly does that 1mm minimum engraved/embossed mean? Is there a technical discussion of the design rule terminology somewhere? Thanks!