I made it for my bathroom towel holder to replace the old crappy one.
This design comes with a safety shape and simple style. The installment is also very simple. it's only got 2 pairs parts, the base part and casing part. All you have to do is to prepare the 16 mm diameter holder stick. Print this file for 2 sides of the holder. Screw the base part first, secondly ,cover the 2 casing parts with the stick together. Lastly, Screw to fix the casing as the photos I showed.
Hopefully it helps you as well.