stl to u3d conversion is probably related to export of recovery of 3D models from STL format to Universal 3D format (.u3d). This should be doable with any 3D modeling tool or converter that deals with 3d meshes, like Meshlab.
Home > Search converters: stl to u3d
Conversion of stl file format to u3d file format beta
Search for stl to u3d converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion stl to u3d type 1:
Convert from Stereolithography CAD data to Universal 3D format graphics.
Microsoft Windows software 
- convert stl to u3d on Windows
PolyTrans|CAD+DCC
A 3D CAD translation software
File extension | File type (from-> to) | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|---|
Convert from stl file | Stereolithography CAD data | No | No | No | No | No | Yes | Yes | No |
to u3d file | Universal 3D format graphics | No | No | No | No | No | Yes | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned stl to u3d. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
MicroStation
A CAD software from Bentley used for 2D and 3D design and drawing
Additional links: Open stl file, Open u3d file
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Conversion stl to u3d type 2:
Convert from Stereolithography CAD data to Ultimate 3D engine model.
Multiplatform software 
- convert stl to u3d on any platform
Meshlab
An open source system for 3D triangular meshes
Additional links: Open stl file, Open u3d file
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