If you want to print height tiles to, then click here:Gravitrax height tile! 10g only! - Free 3D Print Model - MakerWorld

This is a replica of the rails in the Gravitrax sets. It has all three sizes, and they work just like the real thing. No supports are needed, but if the ends don't stick then you can add supports. If you have any problems or want to show off the model you made, feel free to post it below in the comments and I can adjust. Enjoy!