3D models stored as STEP product data files (.stp, .step) are rather common sight and well supported in various 3D modeling tools, so you should have no trouble finding a tool capable of translating .step files to .dae files that are for Collada 3D Digital Assets.
Home > Search converters: stp to dae
Conversion of stp file format to dae file format beta
Search for stp to dae converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion stp to dae type 1:
Convert from ISO-10303 STEP product data to Collada 3D digital asset exchange data.
Microsoft Windows software 
- convert stp to dae 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 stp file | ISO-10303 STEP product data | No | No | No | No | No | Yes | No | No |
to dae file | Collada 3D digital asset exchange data | 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 stp to dae. 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.
AutoCAD
Leading 2D and 3D CAD development software from Autodesk
Autoconverter
A converter for 3D formats
Anark Core
A 3D product data optimalization software
Apple macOS / Mac OS X software 
- convert stp to dae on OS X
Afanche 3D Viewer for Mac
A Mac version of the popular 3D visualisation software
AutoCAD for Mac
A Mac version of popular Autodesk AutoCAD software
Multiplatform software 
- convert stp to dae on any platform
FreeCAD
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
On-line services software 
- convert stp to dae on web
Online CAD converter
A commercial online CAD converter
Babel3D
An online CAD conversion service
Additional links: Open stp file, Open dae file
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Conversion stp to dae type 2:
Convert from Adobe Acrobat Exchange plug-in to Collada 3D digital asset exchange data.
Microsoft Windows software - convert stp to dae on Windows
MicroStation
A CAD software from Bentley used for 2D and 3D design and drawing
Additional links: Open stp file, Open dae file
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