Both STL and STEP formats are fairly common CAD/3D model formats and well-supported in many programs. So you should have no trouble to find a program capable of stl to stp conversion. Below are some choices that should be capable to convert 3D prints (.stl) to ISO STEP format (.stp).
Home > Search converters: stl to stp
Conversion of stl file format to stp file format beta
Search for stl to stp converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion stl to stp type 1:
Convert from Stereolithography CAD data to ISO-10303 STEP product data.
Microsoft Windows software 
- convert stl to stp on Windows
CATIA
A PLM/CAD/CAM/CAE software suite
File extension | File type (from-> to) | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|---|
Convert from stl file | Stereolithography CAD data | No | Yes | Yes | stl editor | Yes | No | No | No |
to stp file | ISO-10303 STEP product data | Yes, CATIA supports stp file conversion as a target file type. | Yes | Yes | stp editor | No | No | 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 stp. 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.
Autodesk Inventor
Autodesk Inventor is modeling application used to create 3D digital prototypes
SolidWorks
A 2D and 3D CAD construction software
3D Object Converter
3D viewer and converter with huge file type support
Creo Parametric
A complete 3D modeling software solution by PTC
TurboCAD
A family of 2D/3D CAD software products for Windows
3ds Max (3D Studio Max)
A widely-used 3D animation application from Autodesk
Autoconverter
A converter for 3D formats
Apple macOS / Mac OS X software 
- convert stl to stp on OS X
TurboCAD for Mac
A 2D/3D CAD software for OS X
Multiplatform software 
- convert stl to stp on any platform
FreeCAD
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
Additional links: Open stl file, Open stp file
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Conversion stl to stp type 2:
Convert from Stereolithography CAD data to Adobe Acrobat Exchange plug-in.
Microsoft Windows software - convert stl to stp on Windows
MicroStation
A CAD software from Bentley used for 2D and 3D design and drawing
Additional links: Open stl file, Open stp file
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