Flexible Shaft Coupler

Here is an alternative to the two parts coupler.

I had a Z axis problem, it was wobbling. I used to have a two parts coupler. When I tightened it, the threads of the Z axis gripped more in one of the two parts, so it was off.

This part is easy to print and simple. It should improve the Z axis wobbling problem.

Hardware required:
2 M3 nuts
2 M3 set screw
2 M8 Nuts