There are plenty of hygrometer [ https://amzn.to/3Lb17aU ] mounts available but I wanted one that could be operated when I have my spool sealed inside a zip lock bag. checking the humidity periodically is all I want to do in order to prolong the battery life.

So I've designed this button operated mount or carrier.

It's a little fiddley to assemble so patience is required. The print in place button needs freeing up with a punch and light hammer but be careful not to break it. It gets better with use too. It needs to be free to slide as the hygrometer button doesn't have a lot of force to return it.

It prints 0.2 layer height with a .4mm nozzle.