Well after doing Rin Rin I had to make Fei Rin too!

XPS source: https://www.deviantart.com/sticklove/art/FeiRin-349069821

Unfortunately there isn't an Ai Rin model in the set. I've been looking around but haven't found one anywhere online.

STL version is higher-poly and ready to print, OBJ + MTL version is lower-poly but has textures.