With this shelf, you can have a sturdy platform in your shower box. It's also equipped with a hook for a shaver and another hook for a sponge. Here you have two choices of bracelets, one with a greater thickness near the diameter and another with a thinner thickness to enhance elasticity during assembly, especially if you have a filament with low elasticity.
Use PETG or PLA+. Avoid using filament that is too rigid!
My advice is that, when using a slicer, it's better to create a honeycomb mesh at the bottom of the shelf to allow water to drain away