My shower curtain kept coming off the curtain hooks, because the curtain has large (10cm) metal grommets, and the hooks have small ball ends that easily let the grommet slip over.

These clips look cute and prevent the curtain from slipping off. They snap on and off the 2.8mm diameter metal hook wire easily for changing the curtain.

My hooks are these Amazon brand ones: https://www.amazon.com/gp/product/B081NH792Q?th=1 with hook wire diameter of 2.8mm. Different hooks may have different wire diameters, but I think this type is pretty common. It should be easy to resize in your slicer for your specific hooks.

Printed in clear PETG, but probably any material works.