I recently designed a bottle holder which can be mounted on the bottom side of tables, cupboards etc. Due to a lack of experience in OpenSCAD I did not make this part customizable in Thingiverse although it is a fully parametric design.
If you want to customize it take a look at the BottleHolder_Instructions.pdf (in Thing Files).
Update: new BottleHolder_Instructions_v2.pdf

If you want to customize it take a look at the BottleHolder_Instructions.pdf (in Thing Files).
The design is pretty rigid, print with an infill < 50%.