Simple Kossel Printing Bed Seat and Clamp

A simple yet effective bed clamp and seat for the kossel plus heated dO=240mm aluminium build plate.
The plate's seat is compatible with standard 20mmx20mm al beams and is suppose to provide a defined three point seat of the print bed additionally minimizing the contact area with the beams.

The clamp's front surface is curved along two planes: The diameter of the outer edge gets larger in screwing direction and from bottom to top. In this way it provides some force during initial tightening