It seems that OpenSCAD is capable of importing of both ASCII and binary STL files. As such, this is probable the most convenient and likely also only choice for making stl to scad conversion work. Unfortunately, we do not know about any other 3rd party software that could perform this conversion.
Home > Search converters: stl to scad
Conversion of stl file format to scad file format beta
Search for stl to scad converter or software able to handle these file types.
Convert Stereolithography CAD data to OpenSCAD CAD model.
We have found one software suitable in our database for this conversion.
Multiplatform software 
- convert stl to scad on any platform
OpenSCAD
A software for making solid 3D CAD objects
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from stl file | No | No | No | No | No | Yes | Yes | No |
to scad file | No | Yes | Yes | scad editor | Yes | No | No | No |
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.
Additional links: Open stl file, Open scad file
STL
Files with stl extension can be mainly found as stereolithography files for 3D printers. Used in many CAD programs as output format for models and prototypes that could be printed in stereolithography devices.
SCAD
Files with scad file extension can be found as models made using the OpenSCAD object modeler/compiler.
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