Water sensor XKC-Y25-NPN holder for Rancilio Silvia espresso machine. You can use this with the CleverCoffee ESP32 modification for espresson machines.
Also gaggiuino might support the sensor in the future - if its built into a Rancilio Silvia.
The OpenSCAD source file is included, so the exact position for the sensor can be easily adjusted.
Two positions are included, one rather empty and one where more than a liter is still in the reservoir.
The sensor XKC-Y25 is press-fit, no glue needed.
The holder attaches to the metal below the water tank, so also there no glue is needed, just push it on the metal:

Update 3/12/2023: Lower water sensor position moved up by 23mm, to ensure water is in the container. cut off the pointy edges at the bottom to improve printability. May reduce configurability in case width of holder is changed.
The author marked this model as their own original creation.