This describes the steps for making the automated water tester. The design has slightly changed since the initial post. The original design required printing a central stalk which all the parts attached to. The stalk was 310mm long, which meant that a large format printer was required. In addition, it was difficult to print it without warping. Based on some suggestions, I redesigned the tester to use a piece of 2020 extruded aluminum as the central stalk as well as in a few other parts that were long. The tester parts can now be printed on a printer with a 150mmx150mmx150mm build area.
The autotester is controlled through a web interface.
For convenience, I have broken the assembly into multiple parts:
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