Physics Entity Gap

[TSy]

I think you are facing the same issue as here.

Place Ball in spherical hole

I think the “precise” collider option might still create a convex hull of the mesh and use that so any holes get covered over. You would need to split the tube into several individual segments and have the precise collider setting enabled for all of them. Edit: In the attached layout you can see how the 4 separate box meshes work but the tube doesn’t. Physics-colliders.vcmx (243 KB)