This is a useful insert to convert a blank Decora (common modern wall plate) into a single keystone jack that can be filled with keystone compatible accessories like A/V connectors, RJ45 jacks, telephone jacks, etc.
I used mine for a panel behind a flat screen TV but there are various uses.
Found this on Thingiverse and moved it over here because I couldn't find a comparable model here on Printables at time of this posting.
Does require supports. I used X1C with AMS to use the ‘Support W’ as support interface and it worked well.
The user re-uploaded this model. The user is not the original author of the model.