This is a three piece fold-able hook for the honeycomb storage wall system by Rosta P
https://www.printables.com/model/152592-honeycomb-storage-wall
The tolerances should be good for a friction fit on all parts. Make sure bridging in enable in your slicer for the main body to print properly. Supports are not needed in the orientations provided.
The author marked this model as their own original creation.