AQM Housing

UPDATE 2020-10-19: The base turned out to be a little flimsy so I've uploaded a new version that beefs it up a little.

This model is a housing for an Air Quality Monitor as described in this [project on github](https://github.com/jpasqua/AQM). You can see an assembled version in operation in this [short youtube clip](https://www.youtube.com/watch?v=52yDZ3B6uIk).

The housing consists of three main parts:
1. An internal bracket that holds the electronics
2. The main housing itself which has two variants:
1. A version with tabs on the sides and screw holes if you want to mount the unit to a spot or other structure
2. A version without the tabs if it will be sitting on a table or other object. The bottom of the housing needs to be open to allow air to flow. In this case, also print the base.
3. A top that covers the housing

The top is separate from the main housing to avoid supports or wide bridges. Just use a little CA glue to affix the top to the main housing. If yo