I've taken the Skadis cable management system created by Sergej, and I've added a 35mm outward hanging hook to hold my DJ controller against the Skadis panels. This could be re-purposed for other objects.

If this model gains traction, I'll make a parametric model for unlimited sizing options.

Standard printing setup, nothing special. Make sure you let the inside locking clip completely cool before removing from the print plate to avoid warping or cracking