Parametric rag holder with quick release, fully adjustable in FreeCAD

I'd suggest tweaking and printing the clamp only until you have the right fit to save some filament — model here: printables.com/model/1196715

Basic instructions (detailed below)

Print solid, with supports, in PETG or similar and upside down.
Use “raw” filament for hinge pins.

Detailed instructions

Adjusting + exporting the model

1. Download and open the .FCStd file in FreeCAD
2. Select VarSet in the model tree to the left 
3. Click on one of the values in the right column to adjust the base sizes e.g. Pipe Diameter to fit your faucet 
4. Click Part just below VarSet in the model tree
5. In menu go to File > Export
6. Choose .3mf and not e.g. .stl as the former is better at multi body parts such as this one.

Slicer

1. Import the .3mf file into your slicer of choice. 
   1. If asked about loading as single object select “no” 
2. Arrange the 4 bodies automatically or manually so they have some space between them.
   1. If printing the rag holder then make sure to flip the body with the arm/stick upside down. 
3. Choose a strong print setting and enable full supports.
4. Slice it and it should look something like this