A clamp to go with the Articulated Arm by Jack, with sizing suitable for a 18mm book shelf, like those of an IKEA Billy, but will of course fit any shelf with that thickness.
The photo shows the clamp printed in Prusament Galaxy Black PLA and was printed with organic supports for the hooks, screw hole and the stem of the connector part.
The connector part was scaled to connectors with a stem diameter of 8mm (so a ball diameter of approx. 15.5 mm) and print files for such a scaled set are provided as well.
The author remixed this model.
Changed the width to fit an 18mm Ikea Billy plank and added a small ‘hook’ to guide a power supply cable.