The better Y- Peace from the great Bambu Lab “Marble Run Kit” with a higher boundary, helps to stop marbles falling down !
No escaping marbles anymore!
Added a smaller radius in the corner to force more marbles in the endtrack.
Check out my other Marble run Kit tuning files as well:
Battery Box: https://makerworld.com/models/71213
Compartment Box: https://makerworld.com/models/50329