I have 2 gcodes attached. 1 with the color changes incorporated for my Prusa i3 MK3, 1 without color changes included. You cannot resize these since they are gcodes. HOWEVER, I have included the .STL file that CAN be resized, saved as a GCODE then you can go to https://blog.prusaprinters.org/color-print/ and include your color changes. If you resize, these timepoints may change. As they are now the time points are as follows:

Began with RED
Paused and changed to BLACK filament at 1.20
Paused and changed to YELLOW filament at 2.00
complete print and enjoy!