it will fit this kind of hygrometer
https://www.aliexpress.com/item/33037396704.html?spm=a2g0o.9042311.0.0.681b4c4dWjn1Dq
You will also need M3 Threaded Heat Set Inserts * 2 and M3 8mm screw * 2
Recommended Print solid.
The author hasn't provided the model origin yet.