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