Heterochromia is a genetic mutation where the person has different eye colours. As it is a distinctive characteristic of someone's face and it's nearly always visible (being on the face) it can make those people self-concious about this, while in reality there is nothing wrong with this. So help your friend out by friendly joking about it to help ease this topic and boost his/her self-esteem. If you get him/her to willingly display it you have both won.
2.5D: 2D logo with additional height for some layers. To print this in colour you can simply pause your printer and switch out the filament at 4mm,5mm and 6mm by default.
The author remixed this model.
Added 2 distinct eyes to warn about heterochromia