Support as separate .stl

Hi All,

Hoping someone out there can give some advice on a speed bump I’ve encountered with Cura. Cura will build support structures but it does not differentiate between ABS and Ninjaflex. Also, apparently it’s not possible for Cura to output the support files as a separate .stl file. So, my question is; what program can create the structural support as a separate .stl file that can be merged in Cura and assigned to an extruder nozzle? Any tips would be much appreciated!