Cobalt Share 4+

Cobalt Share is a free app that allows users to open, view, print and export Ashlar-Vellum CAD and 3D modeling files created in Cobalt™, Xenon™, Argon™ or Lithium™.

Cobalt Share opens .co, .xe, .ar, .li files created in Ashlar-Vellum's Cobalt™, Xenon™, Argon™ or Lithium™ and allows user to view the document, print it or export it to the supported file formats.
It displays exactly what you intended, not some translation that might be just a little different.
It is especially helpful for interacting with clients or production people who are using a non-Ashlar-Vellum product such as:

AutoCAD
SolidWorks
Solid Edge
Pro/E
CATIA

Supported file formats for export include: DWG, DXF, IGES, IGS, STP, STEP, SAT, IR3, FEA, NAS, EPS, CGM, PDF, FAC, WRL, RAW, STL, AI, EXP, DLV, PICT, 3DMF, TXT, PDF 3D and many 2D raster image formats BMP, PNG, JPG etc.