Fractal based model that was copied out and flipped. Then did the merging in Cura to test limits.
This is referenced in this thread: https://ultimaker.com/en/community/39753-2color-print-booleaned-in-cura-24. It was an experiment so I thought I would upload the model so that others can replicate it. Or not.
I did this in Matterhackers PETG Pro series. But feel free to try any you want. I went with PETG to set things in Cura. But mostly because it would show if there were any Boolean errors. It did an amazing job of Boolean ops that would choke my Autodesk products.