I design primarily for 3D Printing output, with the print most often being the finished product. When I am submitting renders to clients for approval before beginning a print, it would be nice to have an Appearance texture that mimics FFF (FDM) extrusion lines in a manner similar to the 3D Wood Appearances.
Essentially, "side" faces would have stacked layer lines, while the "top" and "bottom" faces would have a solid infill pattern. Perhaps there could be a choice between a couple different "Top/Bottom" patterns (e.g. Rectilinear, Concentric, etc.), as well as an option to scale "Layer Height".