This is an adjustable standalone shower head holder. It's to be fastened to the wall with a single 5mm diameter screw. Adjustment is performed with the knob on the side.
The knob bolt is hex head M6, length from 25mm to 35mm.
This is an open-source design. FreeCAD file is provided.
Feel free to modify this thing at your convenience.
Good design is hard work, donations are welcome.
Technical
PLA does the job. Stainless steel bolt is recommended.