Made this simple quarter round shelf liner to keep the built in shelves in the shower clean from any drips from shampoo/conditioner bottles.Size is 215 mm and can be adjusted in slicer if your printer cannot fit it full size (I actually printer mine at 95% to be able to fit on my Ender 3 S1.  I used gyroid infill at 15% but  I do not think it matters.  There is a very small lip around the entire perimeter to help keep any drip in.