I am using the BenQ eReading Desk Lamp WiT both as a (duh) desk lamp and as a fill light for my studio bench setup. This "third arm" follows the lamp's design, is clamped on the lower arm and retracts to support the lamp and extend the lamp head horizontally, far away from the base. If you flip it, it can also be used as a headphone holder.
Hardware needed: 1x Philips drive pan washer head M4 screw to attach the ARM to the HUB and match the other stock screws of the arm joints. 2x M3 hex screws to clamp the lamp's arm with the two HUB pieces. These screws also act as end-stops for the arm.
More info and 3D printing footage in this video: (coming soon)
Here is how you can easily modify this (and any other) design in Tinkercad: https://www.youtube.com/watch?v=JZXR5rOJ_QM
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