For multi color print there is no mmu necessary. Use the different heights to change the colors.
You can customize the size of the magnets in the .f3d file.
Pause the print before the holes for the magnets are closed, insert the magnets and resume the print.
For decoration on little girls birthday parties.
Other unicorn stuff:
https://www.printables.com/de/model/367685-unicorn-magnetic-button-customizeable
https://www.printables.com/de/model/370814-unicorn-fridge-magnet-customizeable
The author marked this model as their own original creation.