Thermometer screen with solar powered ventilation

A thermometer screen for the outdoor temperature sensor component of a weather station.
It's designed to house a solar powered extractor fan as its "lid", which gives a more accurate reading on sunny, calm days when there is a tendency for the thermometer to give a high reading.

The extractor I used is this model from Ebay (https://tinyurl.com/28ytsy4b), though any model needing a 120mm hole should fit. It just slots onto the assembled screen, being held down by its own weight.

The thermometer is suspended inside the screen from the base of the extractor using a piece of wire or similar.

Print alternating "odd" and "even" rings. They are then screwed together using M4 bolts (about 15mm long bolts should be OK).

The screen can be made taller or shorter by printing a different number of rings (I used 6 rings - three odd and three even).

The assembled screen is designed to be fixed to a 20mm vertical pole, held in place by cable ties. The pole bracket part of the print is