To print this in color with one print using manual filament changes:

Just insert filament change codes in your gcode (via your slicer). 

Start with Black

at layer 5 change to White

at layer 11 change to Green

at layer 15 change to Red

The print is done when red is finished.

Printed with 0.2 Layer Height. If you want to scale this model you can scale it on the X and Y axis but the Z axis must stay the same or the filament changes with be incorrectly timed.