Exporting the nether zone on a 3D software (Patreon)

I've finished the nether part of the new map, now I'm trying to export it on Blender (3D software) to finally export it on Unreal Engine 4 for the map. Making huge map is a pain if I only use what UE4 offer me, so I will need to use some minecraft importation to increase the map size and have a better result =)