This is a customizable clamp for a carbon fiber rod mounted to a Kossel/Delta printer to eliminate some of the frame twisting that is possible with the standard 2-triangle w/ posts design.
A few of these, combined with some carbon-fiber rods (or any other appropriately sized rigid dowel rod for that matter), forms triangles/trusses on the sides of the printer, preventing it from twisting.
This is meant to mount to the outside of the vertical beams, using a 2020 (or whatever size extrusion) mounting clamp / "T nut".
Like these: https://smile.amazon.com/dp/B07FPLZXTF
(or print your own with this thing: https://www.thingiverse.com/thing:3050607 )
Inspired by https://www.thingiverse.com/thing:860442 , which has fixed size, rod angle etc. and mounts to the top/bottom beams.