Puzzle Cube Snake

Yeah! this is a puzzle I made by tracing a line through 27 mini cubes so they make a big one.
So, this is just a way of how can you create one, I encourage you to do the same, trace a line on a cube and count the number of corners and straights you have (you have to pass through 27 blocks without repeat, and make sure that it's only a line!)

There are 2 blocks conforming the ends, you'll need to glue them after printing for hidding the cable (an elastic one)

I've uploaded .stl and CATIA f