3D printer file type support For Blender 2.70, I'm trying to figure out:


Which 3D printer file formats Blender natively supports
Which 3D printer file formats Blender can support with the use of plugins/extensions/etc.
Which 3D printer file formats can be converted into another format that works with Blender
Which 3D printer file formats Blender cannot support at all, ever


The most important one of those is the last one (which file types can Blender not import/export/modify at all). Can someone point me to any documentation or help me figure out which file formats fall into which group?
Blender supports the STL (STereoLithography) format which is supported by all printers and considered as standard for prototyping.

Shapeways for example supports the file types: STL, OBJ, X3D, Collada or VRML97/2.

Blender comes with support of STL, OBJ, X3D and Collada. 


Documentation on import formats
Documentation on export formats


When there is a public demand for a specific file format someone will create an import / export addon for it.