Aqara door/window contact sensor case for using AAA batteries. Has a hole towards the back for those who might want to solder wires to the reed switch pins (for things like a deadbolt sensor, other kind of contact sensor, etc).
The first iteration I printed of this model just has some paper stuffed into the back since it was too big for the sensor. Typical shoddy engineering. The case has since been updated and tested/reprinted, so your sensor should fit better. Hope this helps someone out.
The author remixed this model.
Meshed two cases into one for using AAA batteries with an aqara door sensor.