Summary

I have printed the Hex Tie by cahorton, and I have found for me this problem: Visible side is the printbed side of the tiles. At my printer (multiple use of the same capton tape) it is not equal one to annother. So I have made a redesign. Now the top layer is visible side. Also, it is easier to assemble with the connectors.
At assembly, check if the printhead moving direction is the same for all tiles. Turn the hex tiles to same direction.
Mid pieces are assembled with a screw.
Lock (behind neck) I have made:
normal pieces, drilled in the mid, glued super magnet to each.
Pieces 05tie.stl, 10tie.stl, 15tie.stl are with angle 05deg, 10deg, 15deg. I have used 15degree pieces only.