Satisfyingly slow flowing Marble Run to use with tree support only.
Steel ball used: 8mm

See Video for more details:

https://www.youtube.com/watch?v=-zLj6\_tX5aY

https://www.reddit.com/r/3Dprinting/comments/k8jwlk/designed\_and\_printed\_my\_own\_marbel\_track/?utm\_source=share&utm\_medium=web2x&context=3

Print Settings:

VERY IMPORTANT: You have to activate and use tree support in your slicer

The support structure will NOT be removed. It stays on the print and is part of the design.

print time ca. 18h 

Enjoy !

Post-Printing

Leave the tree support structure on the model. Clean up any stringing with a hot air gun.
Use 8mm steel balls as marbles or scale as appropriate