This is a printable Eye for the Octopus Prop from "Attack of the Cyber Octupuses"
I didn´t like the look of LED so i added these instead.
I don´t own the Rights of the Octopus Files but you can get them here:
No special Settings required, transparent Red works best
UPDATE #1 (24.09.2017)
I added a Version with a Hole for a 5 mm LED.
If Sliced in S3D, 15% Infill, Full Honeycomb, makes the Eye look faceted with brighter "Pupil" and a very realistic Appearance (if possible for an Octopus from the Future ;-)