You need to print:
1 Rod
3 Corners
1 Core
1 Core2

Printed with 0.4mm nozzle with PLA plastic.

Can be printed fully without any supports

Good turning, but sometimes stucks half way through. Don't be afraid to rotate further.

The Iternal mechanism almost doesn't show up when the puzzle is rotated!

If you print Rod, be prepared that after a while you will have to print it again with a size 1-3% larger, as the puzzle can become very uncontrollable because Rod is gradually erased as the puzzle rotates. This is why you will need to reprint Rod after 50-100 turns.

the puzzle may be a little wobbly.

Designed in Blender.

Assembly vid: https://youtu.be/yhExnTDbZ7E