11/17/17 update: Uploaded a new .scad file to fix some variables for the third holder.
This is Version 1 of my sponge holder and it is based off of this design: https://www.thingiverse.com/thing:1916733
My wife wanted it with slightly different dimensions and for it to have two holders connected instead of one.
I think I went a bit overboard in making everything customizable. You can choose to make 1,2, or 3 connected sponge holders, each with their own settings. I've included two pictures that show what the variables are for. If you look at the scad file, you'll see a lot more variables that are based off of other variables. You don't want to change those. ;)
Note: The spongeholeratio is not auto calculated. This ratio is used to make the holes on the bottom of the sponge wider.
Printed with eSUN Natural PETG filament. You'll want to rotate it 90 degrees in your slicer and print it on it's side. I've included a picture showing the orientation in cura.
I printed the one in the picture with a brim as I was printing at 95mm/s and wanted to ensure it had good first layer adhesion. More of being overly cautious than anything. ;)