Meshlab system for the processing and editing of unstructured 3D triangular meshes support both PointCloud 3D files (.pts) and Stereolithography CAD files (.stl) so you can process and convert pts to stl rather easily with it. Meshlab is open source, so you can download it for free and try it out yourself.
Convert PointCloud 3D file to Stereolithography CAD file.
We found one software available in the database for this conversion.
Multiplatform software - convert pts to stl on any platform
An open source system for 3D triangular meshes
Convert from pts file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.