The rose keyring was made for the birthday of my friend and this time I decided to print it in two different colours, white and red, thanks to a particular setting of Ultimaker Cura.

Select modify g-code and click add a script and choose pause at height. In this case, I've changed the color at the middle of the total height. The other only value that be could change is standby temperature to 185°C to ease the filament change.