This is an articulated ball-joint arm for the Screwiverse (and thus the Honeycomb Storage Wall). Any screwiverse attachment can be attached to this arm, even as a fixing screw to lock the position.
This arm is very useful to position webcams at weird angles using this adapter:
I suggest at least 3 walls. I added seam-grooves to the ball-joint for slicers to put their seams, which can ruin print-in-place parts when overextruding (looking at you, Prusa MINI). If the slicers don't put the seams into these grooves, try manually painting the seams or try your luck. With the input shaper firmware, printing at 0.35 STRUCTURAL and 150% speed works fine on a Prusa MINI.
The author remixed this model.
just linked for reference