Hey everyone. I am new here... me and my daughter love the Duplo Trains (ok, it is just me for now since she is only 11 months and mostly watching them go around and destroying the track ;-) ). A friend of mine has a 3D printer and he is printing me some custom tracks... for now we have a nice 90 degree angled cross section done... fits almost perfectly and trains drive over it with ease... here is a little video for everyone interested:
http://www.youtube.com/watch?v=zehIN4Peh68
There is a nice hexagonal cross-section coming up soon and a bridge with a middle section that can be repeated many times to have it at any height you want. :)