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.