Rain Gauge remix

Printable parts for the outdoor unit of a wireless packet telemetering rain gauge.

The parts in this design are generally similar geometry from the original (thing 4725413), but none is mechanically compatible with the original design. All these parts are designed only to fit each other.

#### Differences from the original

The Base part in this design includes a built-in bracket for a two cell AA battery holder that was not part of the original. The Sensor in the original design is replaced with a 3D printable enclosure for the hall effect sensor printed circuit board documented here: https://github.com/w5xd/PacketRainGauge. That github repo contains the source files in OpenSCAD and FreeCAD for all the printable parts, and more detailed comments about how all the parts work together.

#### Improvements Jan, 2026
bucket-improved.stl has an insert for a 1/4" hex nut that weights the bucket for a much more consistent volume of water per click.
funnel-improved.stl enlarges the funnel op