This is my marble run contraption project.
The first version was squared shaped. and for a fast prototype it did work.
but the marble loose speed fast and when you stack up layers the marble inside disappears.
This version is more open and has small round magnets to keep all parts together so no ground base tile part is needed.
Current last version. printed upside down on a flat surface 3d print bed to give the marble a smoother path to travel on.
And added bonus marble sits on top of the parts so its easier to follow.
Plans for the further is making a contraption that brings the marble back up again.
smooth out design to increase speed, time and marble travel distance.