Double-sided Chinese Chess — Chinese characters and icons

This is a remix of 3D Printing Professor's two Chinese chess sets, with the Chinese characters on one side and his western icons on the other.  

The characters/icons are just one layer (0.2mm) thick, so they need to be printed with a sufficiently opaque filament — most strong colours should be fine.  This also means only two filament changes are necessary per set.

The G-Code will print the icons first, prompt for a filament change, print the tile, then prompt again and print the Chinese characters.  Check the G-Code preview carefully if you re-slice the models!