Thanks gents! Printing the corners? Hmmm. Never thought of that. Might work, but there's not a lot of corners to worry about and no-one's going to see them. But it's worth to think about in the future. Meanwhile I just created a Federalist convex wall mirror for one of the downstairs rooms. Found a nice prototype on Google and traced it. Then had to add contours. I shaped the roundel part and the shell at the bottom, but chose to just profile the upper decorations and not sculpt them. I also left off the drop since it would probably break off just getting it off the build plate. It's going to be really small and if the parts print too thin they'll fall apart. I could do it as a post op. I'm printing four different sizes working up from scale to a bit larger. You can clone and scale objects right in the slicer which is a nice feature.
SU has a FREEHAND LINE TOOL that let me trace around the top details. You do have to go back and clean up any stray lines and to make sure it's all connected. You can't extrude any depth unless it is a fully connected surface.
Here's the slicer arrangement. I'm printing directly on the plate to avoid any supports. I will use Bare Metal Foil or the Molotow Chrome pen to make the mirror look right. The printer will reproduce all those details. Print time will be about 26 minutes. I used the "FOLLOW ME" SU tool to create the convex and concave shapes. They didn't close completely and I had to draw in the connectors to make them solids.
