Flexi Ferret! The design for the hinges was my own but the measurements and basic ideas came from 8ran's Articulated Slug and jtronics' Flexi Articulated Mouse.
This printed super well, even at the size it was, but I need to adjust the hinges a bit because it can expand in the middle like a slinky.
flexi_ferret_final.stl | 967.4KB |