A shampoo shelf consisting of two hooks and one plank. I printed it in PLA and it has been holding up for 2 months and counting.

For the most strenght you should print these parts flat!

I don't remember the exact settings, but anything above 15% infill should hold up just fine. (I think I had it around 20%)

This only fits shampoo bottles that are less than 72.5mm (2.85 inch) wide at the base.
The hook was made to fit on a shower cabin that is 11.5mm (0.45 inch) thick.

I included the fusion360 files so you can edit it to fit your needs. However, I must warn you that the holes in the plank were done manually and will probably cause problems if you try to change the dimensions of the plank.

Update (12 March 2022): It's still working after 4 years. It seems to have deformed a little bit, but it's still hanging in there.