You must have the SOLIDWORKS ScanTo3D Add-in enabled before you can save parts as the ScanTo3D 3DS file format. There are a few ways for you to enable SOLIDWORKS add-ins as described in this blog article.
However, saving the part files directly as a ScanTo3D file format shows the warning message stating: “No available entities to process through 3DS.”
The problem is due to incompatible types of files. A .3ds file is a ‘mesh file’. It is not compatible directly with graphics, solids and surface bodies.
You must create a mesh file from the file to be exported and then save to .3ds file format.
Create a compatible Mesh file:
Save SOLIDWORKS .STL file from a SOLIDWORKS part file through File > Save as > .STL
Now open SOLIDWORKS .STL file in SOLIDWORKS using File > Open > select the file type as ScanTo3D Mesh (.STL).
The file will then be in a mesh format and can then be exported directly to .3ds file format through File > Save as > Scanto3D Mesh Files