Gravitrax Very High Speed Curve

My grandkids play with Gravitrax a lot. One of the challenges is using a curve after a rocket launcher or after a large drop where the marble has a lot of speed. This curve is a tunnel. I've tested it with the marble at speed and it works well. I've separated the bottom piece (the ring) from the body so that it can print without supports. The ring will snap in, but it's best if you put a few drops of glue to keep it secure.