I really like the original design and a idea for water drain  from user @species_249250. But the nasty overhang on the bottom of his model, I just couldn't print that one to be happy with the result.

So I logged into my trusty Onshape and modeled my own version. It is very simple to print and I believe it will work at least as well. :)

Created from the scratch, but heavily inspired by the species work. Feel free to use it.

Voronoi Soap Dish

Recommended settings
Material: It doesn't matter, I used rainbow silk PLA and some leftover Polymaker PolyTerra 
Layer height: 0.15 for Shell, 0.2 for Tray
Perimeters: It doesn't matter, I used 4
Infill: It doesn't matter, I used 40% because I printed it from rainbow silk
Infill Type: It doesn't matter, I used cubic
Supports: No