This is a modification of Scott Chin's original design from https://www.facebook.com/groups/Delta5RaceTimer/

You can print Part 1 + Top Case 2 for a 4 node system, then print Part 2 and another Top Case 2 to add on another 4 node system to make an 8 node system. Part 1 and Part 2 will lock together to make one case. It was an extremely tight fit for me so I had to do a little sanding to make them fit, but I loosened the tolerances a touch so hopefully it won't be as tight.