Took the amazing design from Ed which was then remixed by Dieter Spillmann and added some variations. I just got a SCX24 and the original track width with the stock SCX24 is super close. I was hoping to figure out a solution so people wouldn't have to reprint track pieces if they wanted to change to a narrower track width. The best I could do was only having to reprint half of the track pieces, e.g. keep one original cube track piece and print one cubes 3 wide or cubes 2 wide track piece and then connect them to get a SCX24 track width.
The author remixed this model.
cut off connector positions for narrow track width vehicles to use.