this is a model I made with fusion 360. the was experimenting with using "sculpting" tools in Fusion 360 for the weld joint.

Raised switch plate has clearance if your switch is not flush with wall, I have not printed this one yet, there should be 2 solid layer before the switch opening and screw holes that will need to be cut open after printing, this should allow for bridge layers. used 3/8 bolt and lock nut to assemble.

Attribution - Creative Commons