A simple outdoor rain gauge suitable for mounting on a fence.

The provided print profile includes gauges for both imperial units (4 inches) and metric units (10cm); The parametric model can be adjusted to either system of units and any desired height. The gauge should be printed in translucent filament; I've used Bambulab PETG Clear for the above photos. The print profile also includes a mounting bracket which allows the gauge to be easily removed and drained; this bracket can be printed using any desired material and is sized to accept a wide range of common wood screws.

After printing the gauge, test for leaks by filling it with water. Coating the bottom surface in a thin layer of superglue and allowing it to fully dry produced a water-tight surface in my experiments; feel free to share your own methods or experiment with other slicer settings that might produce better results.