This is a blank set of wings and a pass through center module which is designed to be mounted in a switch rack. You can find several other designs related to this at the links below.
TP-Link TL-SG108 or Netgear GS308
https://www.printables.com/model/79675-modular-1u-relay-rack-mount-for-tp-link-tl-sg108-o
Trendnet TEG-S80G
https://www.printables.com/model/79674-modular-1u-relay-rack-mount-for-trendnet-teg-s80g-
Netgear GS308
https://www.printables.com/model/79663-netgear-gs308-8-port-switch-module-wings-remix-m3-
If you like this thing, please like it or download it (which helps to get me closer to my first free spool of Prusament), or check out my site, to see what other projects are in the works.
The author remixed this model.