This is the Athens Class Carrier (Model created by Annihilater102) from the Halo mod Sins of the Prophets from the game Sins of a Solar Empire. Special Thanks to
...Plus Unikraken, Annihilater102 and their Dev team for granting me permission to publish it for us all to print.
If interested in seeing these models in battle, please try their Mod - http://www.moddb.com/mods/halo-sins-of-the-prophets , or drop by their forum - https://sinsoftheprophets.com/forums/ to let them know what an amazing job they are doing with these ships.
