This object is yet another remix of https://www.thingiverse.com/thing:4677926. I've previously used that design to create a mini-plate and 3 tile turning bridge.

This design is intended to keep four self returning transfers in alignment and prevent too much loss of kinetic energy as the marble passes down down the line.

You can see the video here -> https://youtu.be/QVOXNaKfTlM

Again props to https://www.thingiverse.com/fredle1957/