A pair of treble/bass clef brackets for a 18cm shelf. They come with a couple 2mm holes that are good enough to be threaded by most screws.
I printed them with 15% infill and 3 vertical / 6 horizontal perimeters, 0.4 nozzle, and they are good enough paired with a couple small metal brackets on the bottom of the shelve. You can bump up the infill and shells for extra strength where needed.
The author marked this model as their own original creation.