This is what I use to hold a laser-cut mesh eye - to make fursuit eyes that fit the model of my 3d-printed fursuit eyelids. If you want to add a transparent half-dome with 6 cm diameter on the outside of the eye you have to rescale the model.
How to make fursuit eyes for my head bases: https://www.youtube.com/watch?v=lYtDX_FqOaA
How the movable eyelids work: https://www.youtube.com/watch?v=CHVk_h86VJ0
https://www.youtube.com/watch?v=wK2EGTdF6YM
The author hasn't provided the model origin yet.