I made the pieces to fit together but sometimes they aren't tight enough in that case I recommend putting g a piece of scotch tape on the track to hold it together. This it my first time using Fusion 360, feedback is appreciated.
in the files there is a fusion 360 file of the single track piece so you can create your own if you want something to do while being locked indoors.
I used 0.2 mm layer height with 3 perimeters. Each piece was printed with supports but they were very easy to remove because the only place that needs support is the front two pegs.
The author hasn't provided the model origin yet.