This holder is clamped onto the sun visor of the car, or onto your shower cabin door. It reliably holds a pair of glasses without interfering. So the sunglasses are easily at hand when you need them.
Easy to print with standard parameters. There is also a short version, which needs less filament. Because of the high temperature in the car, you should use PC or ASA, or other materials that can withstand high temperatures.

Designed with OpenSCAD.

Please take also a look at may new clip-on tissue dispenser