This is a simple cover for cables that can't be directly run behind the NTD unit but want to be hidden away into the backing wall/mounting plate.
Pause the print just before the internal holes are closed up to add 2x 5mm*1.7mm stacked into each hole.
Entire project will use 8 magnets. (and of course double check orientation before dropping them in <_<)
The author marked this model as their own original creation.