The hooks are small and are designed to fit wire shelves with wires 6mm in diameter.
The wires on my shelf vary slightly and for some of them I had to slightly scale the model in the slicer to make them fit more or less loose.
I designed these for a resin printer, but should probably work with FDM.
I recommend ABS like or similar resin with some strength if you intend to have it hold much weight.
The author marked this model as their own original creation.