I was required to have the second arm of my monitor mount being flexibel in height but only had the one that was sturdy and held both monitors at the same height. So, instead of buying a separate arm, I decided to draw an adapter to be able to mount the second arm independently.

It is designed to reuse the already existing pole with 35mm diameter and the already to the arm attached M9 machine screw.

Only thing that is needed in addition is an M9x20 screw to clamp the adapter to the 35mm pole. With PLA the screws will cut their thread themselves but of course this also means, that you have to be careful to not overtighten and therefore lose the connection. Recommendation would be to print with some tougher material.

Test print was done on my Sidewinder X1