This is my first try of an round case for my Wemos D1 mini. I just fixed it with hotglue and put a little capton tape between sensor an ESP8266.
Model has 3 ventilation slits, a hole for reaching the reset button and 2 holes for screws on the bottom part.
The top part holds by friction and you can turn the DHT22 in every position.
Be sure to put your ESP8266 in sleep oder deepsleep mode. Otherwise it could became warm and gives you a little off temperatur readings from DHT22.
0.2mm layer height with 0.4mm nozzle
Print it on the flat side and you are good to go. I printed it without support so bridging near ventilation slits was not as accurat as I hoped. But quality is good enough for me.