Hi Nicolas,
The Export type you require is "STL (Extract Colors)"
In CAESES, please create a scope, let's say "02_Export". Then please locate the BRep/s you want to be exported. Please be sure that, the geometrical entities you want to be seperated do have separate colors assigned.
Then select the folder, change the file type to "exportStlExtractColors" and provide a file name.
Using this procedure, whenever you create an fsc file, the export information will be written automatically.
Please let me know if you have further questions.
Cheers
Ceyhan