Depending how you print them you may need a brim &/or supports, when i printed the Single, Double or Tripple i printed them standing on their base without Brims or Supports, but the Dovetail holder needed supports for the dovetails.
My printer is the Voxelab Aquilia X2
The author remixed this model.
This remix now has Single, Double, Triple & Dovetail battery holders.