Used ribbon cable instead of individual wires.

Socket connectors on servo controller instead of soldering directly

Flexible wire for positive bus

Positive and common bus wires put in separate guides to prevent shorts       

Made wire carrier/servo swivel separate from rib.  Made it with 3 openings to keep the different wires (Power +/- and signal for each servo) separate

New 3D parts to make installation/replacement of servo easier

TPU used for wheels.  More flexible, more grip than PLA material

"Caboose" where electronics are located redesigned with TWO levels

Added motorized wheels to head to ensure the snake moves ahead

Added a ball-bearing caster to front of head, for balance.