Anti Z-Wobble coupling

Often it´s a problem with these flexible aluminum couplings. The holes in the original ones are often too big so that when you tighten the screws the coupling will be sligthly out of alignment and you´ll get these "Z-Wobble" lines in your print.
Cheap replacement couplings won´t make this better.
The expensive ones are often (as the name said) too expensive...
So now you can print one that is not much bigger than the original ones but it should work much better.
To assemble it you´ll need so