Made them to print those with glow in the dark, but there are many ways to use them. I printed those with 0.8mm nozzle, therefore it should be easy to scale them down if you use 0.4 nozzles.
Add them together in the combination you need and scale them to your needed size.
If you plan printing them from translucent filament they should be 100% filled. Easiest way with those models is to have only bottom and top layers .
The author marked this model as their own original creation.