Modified RoboMagus's handy drybox hygrometer mount to work with the Hoyiours square hygrometer with side vents. It's not the cleanest (re)modeling ever but I do what can with what I can. I did go back and add a radius chamfer to the faceplate opening however.

I printed the front cover face down for the texture finish, although the slicer will default to face up. Support materials in the bolt holes can be popped out with a hex key, if you happen to have any around. :D