This is a small Rose Keychain prepared for printing with 3 colors of filament.
Size is about 50x28x5mm only,
First part of base color has 3mm height, Second (green) 1mm, and top 1mm too.
I have used Cura Pause at Height plugin to change filament when it needed.

Wanhao Duplicator i3

No

No

0.2mm

20%

I have printed this one with 0.4mm nozzle and 0.2 layer size.
Cura Plugin "Pause at Height" was applied two times at 3.2 and 4.2mm to pause printing for filament change.
Check resulting print on photo.