I liked caj380's design but needed only two hooks and not much else so I sliced it up and got it down to just two hooks and then drilled two holes in it so that I could mount it to the bottom of my electronics holder in between the two Zen Watch 2 charger mounts I printed and installed. The design print failed but finished enough that I was able to shave the top and still use it.
I took caj380's design into Slic3r and cut the sides off while leaving the outside walls and then cut the top off just above the hooks. Next, I cut the hooks off and kept them and then flipped the main rectangle and then moved the hooks back to the main rectangle and then exported the STL. I imported the SLT in Meshmixer and then ran the analysis and then Inspector and repaired the STL and then exported it. Finally loaded it into Qidi Print and printed it.