The “lip” just friction fits behind your thermostat or light switch bezel.
In case you have to loosen something on your electrical equipment - only open these, if you really know what you're doing! Electricity can turn you small, black and ugly.
Notice the way I print this, sitting on its “roof”. I also include the 3MF PrusaSlicer project, where I set a good seam location (better than in my print - gotta love paint-on seams!).
My print came off quite fuzzy and needed sanding and cleaning up the overhangs. After changing to an all-metal heatbreak, I still have to work on my retraction settings, it seems. Also, I whish Prusa would implement the material shrinkage compensation from SuperSlicer … because I'm too lazy to maintain two different slicers :)
The author marked this model as their own original creation.