Wall mount box for power supply ideal for cable ceiling pulleys - https://www.kiwidesign.shop/products/v2-kiwi-design-management-retractable-vr-accessories
In case you don't want to pop up top lid every time you put strain on the cable use Bottom_FirmerJoints.stl or some cable clip like https://www.thingiverse.com/thing:4142681
This is my second model here so any feedback would be more than welcome :)
Inspired by https://www.thingiverse.com/thing:4679798.
The author marked this model as their own original creation. Imported from Thingiverse.