I Went back to the origional models, repaired and reoriented them, then added holes for 10x3mm magnets. I then split those on half and added holes on the new face as well, and mirrored all models.
The result is that you can add them together using the following logic to create 1 of 16 possiple variations from the 4 basic models.
D+AB, AB+C, B+CD, CD+A
Add the quarters to the halves using glue and the incuded 10x5mm pegs to create a ¾ pie slice.
Or, you could print A,B,C, and D and put magnets on all sides. Whatever floats you boat.
The holes are are modeled with .1 mm clearance. I've modeled and included a simple knob style magnet you can use to test fitup and assess the color orientation if using a coextruded filament. If it doesn't fit; scale up the models 1-3% and try again.
A drop of super glue is used to join magnets and/or pegs to the pockets.
I also mirrored the origional models and merged them to make wholes for further remixing.
The author remixed this model.
I've add ¼ sections and 10mm holes to make them more modular.