This dice is not fair. You get a certain number, for example 6, much more often.
The reason is that one side (for example 1) is a bit heavier than the others. This heavier side will often lay down.
To produce the heavier side use “infill” in a modifier in PrusaSclier.
For the whole object set infill=10%
For the modifier set infill=100%:
This has already been done in TrickDice.3mf.
If you want a different number, just rotate the cube in PrusaSlicer.
If you want a rounder cube - this also affects how often your number comes up - use TrickDice_2.stl.
If you want a dice with other dimensions use TrickDice.scad. But still you have to define the heavier side in PrusaSlicer.
The author hasn't provided the model origin yet.