Peak Design Capture - Compatible Holder

For the printed model, it's necessary to insert a spring from a pen. It can be printed in one piece and without supports. I recommend PC Blend Carbon Fiber or a similar, more durable material.

The backcover uses the 1cm-uni-mount system, which consists of two holes spaced 1cm apart, allowing you to easily attach a different type of holder and thus create your own combination of connections.

See more at 

https://www.printables.com/search/models?q=tag%3A1cmunimount

I use Prusament PC Blend Carbon Fiber. 0.15mm Structural, 4 Perimeters, 10% Gyroid infill.

Once printed, simply press the button; it clicks and releases. Put the pen spring inside and that's it. 

The video on how to finish preparations after printing is here