This is a model of the The Eye of Agamotto, from the Marvel movie "Dr. Strange" (2016).
I used the Eye as a present. Inside the Eye is a hole in which a micro-sd card fits. The sd card must be inserted during the printing process. I used it as a time capsule, so the person who got it can open it in some years.
But you also can just print the eye ;)
The size I printed was 80% of the original. (85mm x 65mm x 15mm)
Bigger print will be no problem. If you want to print it smaller, the details may be not so good.