Here's a file with 3D text where you can "project" the letters or use them as you like. These aren't smooth either, but instead of segmented curves there are chamfers or long straight lines.
Font_Cutting.ics ( 1.22mb )
Number of downloads: 100
The font used is called Banner Bridge and you can find it here:
http://fontstruct.com/fontstructions/show/125947I was involved in creating the "Negative Letters" catalog and at the time we didn't have a "smooth" option for the letters we made. It worked fine for those who wanted the catalog at that time though. They are all made with the IronPRO XT tool 3D Text. As you can see on the image below the newer version has more options than before and works really well. With the option
Optimize Profile you'll get arcs instead of polylines.