Made my own take on the Sandevistan.

Includes Vertebrae, a Tail Piece, a Neck Connector, and a Neck Piece. Also includes Diffusers for each, which is meant to be printed in transparent filament.

The print profile has hollows in the tail piece and vertebrae for a 20mmx3mm magnet, with a print pause so you can insert the magnet. I recommend putting a bit of superglue before adding the magnet, and giving it a few minutes, since the nozzle may attract and displace the magnet.

The channels can take LED strips up to 10mm in width. I kept the battery pack on my belt, though a back pocket also works. If you need help to make a belt carrier for your battery pack, let me know.

I used super glue to fix the diffusers, and double sided tape to hold the LED strips down. I let the LED strip + wiring carry the neck connector over.

You shouldn't need supports to print it. Internal may be a liiiiiil messy but it'll be fine.