Just a quick Print I did and thought I would share in case anyone else found it useful.

Simple Soap bar holder that makes sure the soap bar does not get soggy and disgusting ;-)

Hooks onto one of the Ikea plastic suction cup hooks (for some reason they don't seem to make a soap bar holder).

I included the OpenScad model so you can make modifications if required :-(Not my best work, this was a means to an end)