By request of the community here is a smaller version of my Honeycomp mod that can be mounted directly to the wall.
Here you can find the original version of the Honeycomp storage wall
https://www.printables.com/de/model/152592-honeycomb-storage-wall
Here you can find my remix in the original size
https://www.printables.com/de/model/422218-honeycomp-direct-wall-mounting
The author remixed this model.
smaller version