This is what I have been using so far with my Replicator 2. Works great. This is a script driven tool. You describe the shape you want to create using a simple scripting language.
This is a freehand 3D drawing tool. It's really big, you can make movies with it. Be prepared to spend a year or so learning how to use it.
A design story
Some notes on an object I made, a handle for the lid of a ceramic dish. 3D design example