The liquid sensor thread got me thinking.
A lot of you guys have built some very impressive, clever and complex systems. You all post them, we admire them, and the show goes on.
For all of you that have a couple dozen batches done on your systems, would you please take a moment to consider what, in retrospect, you would change? I think that would be at least as valuable the build threads themselves.
Did you design something wrong, or unsafely? Did something blow up? Or something you thought would be awesome turn out to be disappointing? Do you wish you had implemented a XXXXXXX?