Quick model of a 2 sided D4 I threw together in TinkerCad. Prints on one of the curved ends to preserve each sides quality as much as possible.
There is a model for just a single D4 and also to print 6 at once. I used tree supports and a brim on my in Cura and mine came out with no issue.
Design inspired heavily by dice listed on Dice Envy though the model itself is my own.
The author marked this model as their own original creation.