OK, so after this little discussion, I got looking into converting this stuff for 3D printing.
Now as some of you know, I've been using the free/open program OpenSCAD as a tool to design 3D objects for printing. In a similar vein I had previously used the free/open program InkScape to convert graphics files (JPG, GIF, PNG, etc) into vector-format files for vinyl cutting.
So I'd been trying to import the vector files that InkScape produces, into OpenSCAD to generate a 3D STL file for printing and hitting a number of problems (note, you can surface .JPG files in OpenSCAD, but then you hit the issues of rough edges from pixellation). So while investigating these issues on the ol' interwebs, Lo and Behold, I found there's an add-on/extension for InkScape in thingiverse that allows you to convert a vector outline to an extruded OpenSCAD file! (https://www.thingiverse.com/thing:25036
This means that not only can we solve @chickenwire
's problem, but you can print a nice 3D version of any graphic (or combination of graphics) for displays, car emblems, etc. (The Sol/Sky silhouettes come to mind).
As an example, below are screenshots from OpenSCAD of a meter-wide (5mm high) version of the Solstice script logo, along with a close-up of an "S" to see the smoothness of the edges. These can be easily scaled down, or up even further, ratio-changed etc. Now, it is a bit of a convoluted, multi stage process to get here, but at least it's doable:
1. InkScape: open graphic; convert to vector, resize as reqd; convert to OpenSCAD file.
2. OpenSCAD: open file from 1.; render; save as STL.
3. Cura (or similar) slice and render to GCode file
4. Print on 3d printer. Iterate back to 1.
Ahhh, what fun!