Hello Dr. D.
Do to I did not know what filaments you was using the sample above was if your part was just a basic pla and we would use basic pla as the support base then use a pva or breakaway support for the interface layers this would allow less filament changes and the part will print way faster and save filament so look at your slice times and you will see what I’m talking about.
The 3mf file will have more information.
This is why they prefer 3mf files and this file type was made for 3d printer but the other file types are ok to use most people are using step or stl files but if you have a choice then ya use the better one.
Think of it like vhs vs hd-tv 
Style = default = This Link will show you why and when to pick your filament.
Being you are new to 3D printing, test out with basic pla and support combos use the cheap stuff save your carbon fiber filament until you have some good working settings.
Tip: With pla carbon fiber filament don’t go lower than 0.15 layer height or you will get under extrusions with a .4 nozzle.
We would need more information on your pla-cf settings used.
Happy 3D Printing 
