I made a Cosmia 3d model in
3d pony creator
Cosmia 3d ponylumen 2 by KopaLeo
“Help I’m stuck in an abstract vector space!”
Cosmia 3d ponylumen 3 by KopaLeo
See more angles and download the 3d object files here.
This file in particular can be loaded into the pony creator for manipulation.
This is a zip file of obj files, which can be opened in 3d modeling softwares.
Also you would need to upload the cutie mark separately into the 3d pony creator.