I found Andrew's design quite useful as it rigidly fixates the switch, even when (un-)plugging ethernet cables. The present design has openings for better ventilation, since the original design was blocking the vent holes present in my TL-G116E.
I used PETG for stability reasons; had to print it lying on the heat bed as shown as I didn't want to use supports. But PLA should work nonetheless and should be even easier to print.
The author remixed this model.
The original design was blocking the air vent holes of my TL-116E so I added some hexagonal holes to prevent heat accumulation.