These larger hooks are a medium size between my smaller House Hooks and the large Strong(er) cable wall hook.

They've been designed to hold heftier items than the small hooks. In particular I found them good to hold parts organizers, as shown here. The hole clearances are ~4.2 mm, and they fit 2x common #8 screws perfectly.

Shown here printed in Prusament matte black PETG with 7 walls and 5 top/bottom surfaces.

PLA probably also works well, but depending on how heavily you load them, you should monitor the hooks for creep over time (a known issue with PLA) (use common sense here and it will be fine).

If you want something super-strong I recommend printing in polycarbonate, PACF, or similar engineering filaments with high tensile strength and stiffness. I've printed a few of my other hooks in Prusament PCCF and they're very rigid and strong, and I couldn't make them bend with my hands if i tried.

Printing tips:

If printing in PETG, you may wish to use a small brim or mouse-ears. Prints great at standard 0.2 mm layer height.