Hygrometer housing (5year+ battery life)

Use case / Problem description

Monitoring the relative humidity in your filament boxes is essential. After a while the silica (or whatever you use to keep the air dry inside the box) will be saturated. Your filament will no longer be dry and your print results will notable dotierate. PETG is notorious for bad print results when wet, but there are more exotic materials that are far worse. Even on PLA it could show recently that a very old spool, that was always simply lying around in my basement, did show bad print results. After I did dry it for a few hours, it was as good as new. So even PLA is not immune to taking on moisture. 

The instruments for these devices are very cheap to get from numerous suppliers, but they come without a housing. This is where this little housing comes in.

Another factor is that the instruments come with a LR44 battery, which typically runs out in less than a year. I got tired of replacing the batteries in all my filament boxes frequently. The size of the housing allows to connect a AAA battery, which should be good for the next 5 to 10 years. 

Printing

The two parts are very easy to print. Simply print them in the uploaded orientation. No supports are needed. The material is not critical, I tested with PLA and PETG, I am fairly sure others will work as well. The numbers of perimeters and the the infill does not matter, you can leave the default settings. 

Assembly

The snap hooks in the cheap instruments are a pain. Therefore I decided to simply leave the opening in the front big enough and simply glue in the instruments with a few drops of hot glue. The holder for the AAA battery, should you choose to use one, can also be glued in with hot glue. 

Happy printing!