Milan keychain totally printed with 3 PLA filaments (black, white and red), there was no post-print work.
The template size is about 37x65 mm, and the printing time is about 35 minutes with a printing speed set at 60 mm/s.

As for color change, I printed this model with a layer height of 0.2 mm, accordingly:
 

• The 18th layer (height = 3.6mm) is the last of the black color, then you have to make a filament change and insert white;
   
• The 24th layer (height = 4.8mm) is the last of the white color, then you have to make a filament change and insert red;
   

I recommend printing next to the keychain a small cube that will be used for the filament change and in particular to purge the filament as best as possible before going back to printing the actual keychain (see slicer image).

I hope you enjoy it, and always forza Milan! 🖤⚽