Hi!
Playing with procedural generation i found a solution for randomly generated marble-mazes.

Also published a big collection here: https://cults3d.com/en/3d-model/game/procedural-marble-maze-full-set

Designed for 5mms bearings so you can scale in your slicer if using another ball size. --> Tip: Scale = (ballsize / 5) * 100 <--

For details and videos about the creation process check this Twitter thread:

https://twitter.com/ferjerez3d/status/1233729371741048832?s=20

No supports required.
Sucessfully printed with 2 perimeters / 3 tops / 3 bottoms and low infill (10-15%)

Have fun!