I really liked the design of the Kossel carriage bei 3DPB. But it seems he lost his "source files".
So I re-created the desing for my Kossel built using the Duet Smart effector and Haydn Huntleys Magnetic Rod-Ends (or at least the "balls" from Haydn).
I hope this might help some people.
The design is for MGN12H carriages (mounting holes 20x20mm).