Headphone hanger for thin plywood

We just needed a small one so I whipped this up to hang headphones on a thin plywood board/shelf.

The space between the hangers is 8.7mm thick, hopefully it will slide tightly onto the plywood desk top. If it's loose I intend to sink a little screw in, but I don't think it'll be necessary.

Thanks for looking! I'll update with a print photo when it's done printing.