This is a MultiColored Thwomp that uses the "Filament Change" script in Cura to swap out the filaments mid print to get the different colors.

https://www.youtube.com/watch?v=uYFj21OlkjQ

For the 2D Thwomp:
White = Initial Layer
Grey = Filament Change at Layer 3
Black = Filament Change at Layer 5
Red = Filament Change at Layer 7

For the 3D Thwomp:
Grey = Initial Layer
White = Filament Change at Layer 101
Black = Filament Change at Layer 103
Red = Filament Change at Layer 105

You could also use pause at height if your printer doesn't support m600 the filament change.