Its a 3D printed housing for the KWS-AC301 wattmeter, the idea is to install it in-line with an extender cord, so you can connect things to it later, it doesn't need glue, just 2 zip tie.
It uses the coil that can be opened.

The case is printed in TPU 95 and the pins in PLA, you will need to print 6 of them.

The little grill is to put there the thermometer.

You will also need some cable and 2 screw terminal, I also used some hollow tips.

https://es.aliexpress.com/item/1005003482510474.html?gatewayAdapt=glo2esp&spm=a2g0o.order_list.0.0.21ef194dkc1Ch

3 perimeters for the case, print the pins as you want.