This is an improved version of the retaining ring alarm cover. I had a Ring alarm door/window sensor on my sliding glass door, after closing it a few times it would give me a tamper warning as the sensor would slowly slide off the adhesive base. There is a lip added to this cover so that it overlaps the adhesive base on the sensor side to prevent it from sliding off and hopefully prevent tamper warnings from closing the door.

To install, mount the ring sensor to the adhesive base and just put this cover on top firmly. The lip should prevent the sensor from moving and causing tamper warnings.

A matching cover is also provided for the magnetic side, which is straight from Tijnoz.

I printed this in petg, I'm sure it would be fine with other materials.