Background
I wanted to print the original with rails however because of the fillets they would require supports or would print with droops. I used the provided f3d file to slightly narrow the bridge and instead use a chamfer on the rails so they print without supports and fit snugly under the track to keep it in place during play.
Print Instructions
You'll need to print 2 to make the complete bridge and they can be printed as oriented in the files and require no supports. I printed mine with 10% adaptive cubic infill on .25mm layers and it's plenty strong.
The author remixed this model.