The weather wall got the world's most expensive hydrometer, an essential instrument for printing TPU & using a swamp cooler.  It was made from 2 day job boards.  Helas, the readout is too small for lions to be very happy with it.  At least it proved lions would not be happy with any commercial sized panel.

Making 7 segment displays out of hundreds of bare LED's & transistors became somewhat of a drag over time.  There are LED strings, for a lot of money.  

It was surprising how much humidity varies from 25-50% in the apartment.  Taking showers while printing TPU is definitely out.  The lion kingdom still has barometer chips from 10 years ago, but Calif* rarely experiences any pressure changes.