I've designed a 100% compatible Duplo train rails to print with a 3D printer. Say goodbye to the expensive gray train tracks, now you can even print pink rails ;-)
Currently I'm working on a bended rails.
If you like it, and print one yourself, please share a picture. I always find it funny to see things I designed used by others.
It's not completely the same as the original rails, I've designed it to print without support material. But it's 100% compatible and as you can see, and it fits perfectly on original Duplo plates.
The example is printed on a Felix 1.5 3D printer