A hook
thingiverse
I stumbled upon several unique hooks on Thingiverse and came across an amazing parametric hook generator too. Nevertheless, none of them suited my requirements, prompting me to design one myself. The crucial part I needed was a hook that could hold onto a rubber band's hook, so the underside features an arch to perfectly accommodate it.
Download Model from thingiverse
With this file you will be able to print A hook with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on A hook.