Hi Bill,
I'm still using "Carrara Studio" (V.3), which is the evolution of some software originally called "Ray Dream Designer", then later "Ray Dream Studio". (
http://www/eovia.com )
I don't generally print plans from Carrara, but instead, use it to quickly visualize design shapes and equipment installation. (and to show guys on RCU my latest designs) I can import and export dxf, 3ds, obj, and it's proprietary file format, ".car". The modeler will allow importing of EPS files, so I can do cross-sections in Illustrator, then use them in Carrara, if I want to.
I bought it new, and purchase upgrades as they are offered. I am 100% familiar with it, since I've been using it for about 10 years.