This is a six sided dice made up of an individual interlocking part for each side. The interlocking is just enough to hold the parts in place and a rubber band is needed to hold the dice together. Dice sides can be any combination of numbers 1 to 6. For some background see my blogpost at https://tribo3d.blogspot.com/2019/12/modular-dice.html .
I am using coloured No. 16 rubber bands which I wrap round the cubes twice. If you don't have different coloured filaments, then the rubberband colour can be used to distinguish between dies with different face combinations.
Update, Jan 13, 2020, I have added a boardgame which can be used to complement the customisable 3d printed dice, it is the downloadable pdf file in this Thing. Most of the work was done on this game about 10 years ago, and I haven't substantially updated it so it uses 2d cad and printing to make figurines. Rather, at some stage, I will write a slightly altered CYCLE CHALLENGE 2020 boardgame making use of newer 3d printed dice and figurines. See http://tribo3d.blogspot.com/2020/01/cycle-challenge-boardgame.html for a few more details