I have added lipped edges to provide a much better in place fixing to the base plate for better height and tile stability. I have tested this with PETG using JDO's basic tile (https://www.printables.com/model/213702-marble-track-basic-tile-v2-gravitrax-compatible). EDIT: Updated the model for better fit and tolerances.
No Supports required, tested at 2.8mm layer height.
The author remixed this model.
I have added lipped edges to provide a much better in place fixing to the base plate for better height and tile stability.