This was designed to hold sheet music in place as shown in the picture. It was designed in Onshape as I was looking at a picture of a treble clef.

I designed 2 models. In this model the width of the paperclip is in the shape of a rectangle. In the other model, the paperclip is round.

I find the rectangle easier to print on my 3d printer because I can have the base of the paperclip at the same level as the base of the treble clef. No support is needed. It prints well in pla, silk and petg.

I only have an FDM printer but I imagine it can be printed in a resin printer.