I wrote a new blog post on Making Plant133 More Reliable.  It covers the fix of a bug in the PCB, and the most common part failures: pumps and moisture sensors.

Here is a recent example of a moisture sensor that failed due to corrosion.

I'm trying out a fix of sealing the edges of the sensor PCB with epoxy to see if that will alloiw it tor survive longer.

I also posted a brief note about 3D-printing fixtures for aligning stencils with PCBs when applying solder paste. This made board assembly much easier!