I recommend printing thick layers with no support. It's going to take a while since this is a large print. You can edit the SCAD file if you want to enclose different size battery packs.
The packs I used: https://hobbyking.com/en_us/turnigy-5000mah-5s-30c-lipo-pack-xt-90.html
The author hasn't provided the model origin yet.