There are other suitable designs for TP-Link SG108, but I didn't like them; I designed one in which you can easily slide the switch inside the rackmount. The hooks in the middle tightly fit with the body of the device, and it keeps it in place.
How to print:
How to assemble?
The hooks are designed to snap fit into the space defined in the unit but depending on the print, material, infill, and stuff, they might be a little loose; simply glue them in place to be sure.
These hooks not only won't let the unit fall over from the back but also fix it to avoid moving, making it easy to take the unit out.
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