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Garrett Durland shared on Thingiverse:

This project started with the Ball joint articulated octopus by Ellindsey. After printing some tentacle segments with clear filament, I wanted to illuminate my octopus! I used Tinkercad to design and print an illuminated battery powered “rock” that the octopus can chill on. LEDs in the rock shine through his clear head and clear tentacle segments. The original octopus was scaled to 142% to be big enough to fit around a rock that could house an 18650 Li-ion battery.